diff --git a/ChangeLog.txt b/ChangeLog.txt
index e78b56c3..a359fcdd 100644
--- a/ChangeLog.txt
+++ b/ChangeLog.txt
@@ -1,3 +1,7 @@
+3.7.0 - 1/12/2019
+Updated:
+- Switch to python3
+
 3.4.3 - 19/05/2019
 Updated:
 - Update gen_repos_files.sh to version 1.94
diff --git a/INSTALL.md b/INSTALL.md
index fa31fbee..2de1a12d 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -3,7 +3,7 @@
 
 ##### Python & OS Support
 
-Slpkg works with Python versions 2.7.5+ .
+Slpkg works with Python versions 3.7+ .
 
 Slpkg works on Slackware distribution and possibly in some Slackware based
 distribution like SalixOS, Slackel etc.
@@ -22,4 +22,4 @@ There are mainly 3 ways:
 2. Download binary package from '`https://sourceforge.net/projects/slpkg/files/binary/`'
    and use Slackware command '`upgradepkg --install-new <slpkg binary>`'
 
-3. Using pip: '`pip install https://gitlab.com/dslackw/slpkg/-/archive/3.4.3/slpkg-3.4.3.tar.gz`'
+3. Using pip: '`pip install https://gitlab.com/dslackw/slpkg/-/archive/3.7.0/slpkg-3.7.0.tar.gz`'
diff --git a/KNOWN_ISSUES b/KNOWN_ISSUES
index 1a0cf150..68789eb2 100644
--- a/KNOWN_ISSUES
+++ b/KNOWN_ISSUES
@@ -1,9 +1 @@
 Known issues:
-
-- Dialog utility crash in option --buildlist when move with arrows
-    sometimes without yet that create big issues.
-    Issues reference here: 
-    https://sourceforge.net/p/pythondialog/bugs/6/
-    
-    Upgrade dialog utility from here if only necessary: 
-    https://gitlab.com/dslackw/SlackBuilds/tree/master/dialog
diff --git a/bin/slpkg b/bin/slpkg
index 573fb380..86e5f175 100755
--- a/bin/slpkg
+++ b/bin/slpkg
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # slpkg file is part of slpkg.
diff --git a/clean.py b/clean.py
index 39d63a07..4977f651 100755
--- a/clean.py
+++ b/clean.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # clean.py file is part of slpkg.
diff --git a/man/slpkg.8 b/man/slpkg.8
index 56723275..42db813e 100644
--- a/man/slpkg.8
+++ b/man/slpkg.8
@@ -68,7 +68,7 @@ Remove custom repository by name.
 .SS repo-enable, enable or disable repositories
 \fBslpkg\fP \fBrepo-enable\fP
 .PP
-Enable or disable repositories via dialog utility (require python2-pythondialog)
+Enable or disable repositories via dialog utility (require python3-pythondialog)
 
 .SS repo-list, repositories list
 \fBslpkg\fP \fBrepo-list\fP
@@ -268,7 +268,7 @@ build or install etc. Use "--checklist" additional option to load all repository
 .PP
 Additional options:
 .PP
-\fB--checklist\fP : Enable dialog utility and checklist option. (Require python2-pythondialog)
+\fB--checklist\fP : Enable dialog utility and checklist option. (Require python3-pythondialog)
 .PP
 \fB--case-ins\fP : Search package name in repository with case insensitive.
 
@@ -304,7 +304,7 @@ Additional options:
 .PP
 \fB--tag\fP : Remove packages with by TAG.
 .PP
-\fB--checklist\fP : Enable dialog utility and checklist option. (Require python2-pythondialog)
+\fB--checklist\fP : Enable dialog utility and checklist option. (Require python3-pythondialog)
 .PP
 \fB--third-party\fP : Remove all the third-party packages. (Be sure update the package lists before)
 
diff --git a/requirements.txt b/requirements.txt
index e4ea7f59..d6717b83 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 # Slackware Linux (based)
-# Python 2.7+
+# Python 3.7+
 # GNU wget
 # GNU coreutils
 #
@@ -9,4 +9,4 @@
 # httpie (alternative downloader)
 # pygraphviz >= 1.3.1 (drawing dependencies diagram)
 # perl 5 language and graph-easy >= 0.75 (drawing dependencies ascii diagram)
-# python2-pythondialog >= 3.3.0 (Python interface to the UNIX dialog utility)
+# python3-pythondialog >= 3.3.0 (Python interface to the UNIX dialog utility)
diff --git a/setup.py b/setup.py
index 5487a921..8b3d55f1 100755
--- a/setup.py
+++ b/setup.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # setup.py file is part of slpkg.
@@ -38,7 +38,7 @@ INSTALLATION_REQUIREMENTS = []
 DOCS_REQUIREMENTS = []
 TESTS_REQUIREMENTS = []
 OPTIONAL_REQUIREMENTS = [
-    "python2-pythondialog >= 3.3.0",
+    "python3-pythondialog >= 3.3.0",
     "pygraphviz >= 1.3.1"
 ]
 
@@ -86,9 +86,7 @@ setup(
         "License :: OSI Approved :: GNU General Public License v3 (GPLv3)",
         "Operating System :: POSIX :: Linux",
         "Operating System :: Unix",
-        "Programming Language :: Python",
-        "Programming Language :: Python :: 2",
-        "Programming Language :: Python :: 2.7",
+        "Programming Language :: Python :: 3",
         "Programming Language :: Unix Shell",
         "Topic :: Software Development :: Build Tools",
         "Topic :: System :: Archiving :: Packaging",
diff --git a/slackbuild/README b/slackbuild/README
index 80c0f115..ef10d2b7 100644
--- a/slackbuild/README
+++ b/slackbuild/README
@@ -5,7 +5,7 @@ to install packages. Slpkg makes it easier to maintain groups
 of machines without having to manually update.
 
 Optional dependencies:
-   python2-pythondialog (for dialog box interface)
+   python3-pythondialog (for dialog box interface)
    pygraphviz (for drawing dependencies diagram)
    graph-easy (for drawing ascii dependencies diagram)
    aria2 (alternative downloader)
diff --git a/slackbuild/slpkg.SlackBuild b/slackbuild/slpkg.SlackBuild
index 2d5b3735..437131cd 100755
--- a/slackbuild/slpkg.SlackBuild
+++ b/slackbuild/slpkg.SlackBuild
@@ -63,9 +63,6 @@ fi
 
 set -e
 
-PYTHON=python
-# [ "${PYTHON3:-no}" = "yes" ] && PYTHON=python3
-
 rm -rf $PKG
 mkdir -p $TMP $PKG $OUTPUT
 cd $TMP
@@ -83,14 +80,7 @@ find -L . \
 # skip pip installs
 sed -i 's/if "install"/if ""/' setup.py
 
-# Python 3 support temporarily is out until new Slackware version
-# will be release
-# if [ "$PYTHON3" = "yes" ]; then
-#  sh convert-py3k
-#  cd py3k/$PRGNAM
-#fi
-
-$PYTHON setup.py install --root=$PKG
+python3 setup.py install --root=$PKG
 
 find $PKG -print0 | xargs -0 file | grep -e "executable" -e "shared object" | grep ELF \
   | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true
diff --git a/slpkg/__metadata__.py b/slpkg/__metadata__.py
index 4acc08d0..5e3c35e5 100644
--- a/slpkg/__metadata__.py
+++ b/slpkg/__metadata__.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # __metadata__.py file is part of slpkg.
@@ -78,7 +78,7 @@ class MetaData(object):
 
     __all__ = "slpkg"
     __author__ = "dslackw"
-    __version_info__ = (3, 4, 3)
+    __version_info__ = (3, 7, 0)
     __version__ = "{0}.{1}.{2}".format(*__version_info__)
     __license__ = "GNU General Public License v3 (GPLv3)"
     __email__ = "d.zlatanidis@gmail.com"
diff --git a/slpkg/arguments.py b/slpkg/arguments.py
index a61ebaf1..c88907bf 100644
--- a/slpkg/arguments.py
+++ b/slpkg/arguments.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # arguments.py file is part of slpkg.
diff --git a/slpkg/auto_pkg.py b/slpkg/auto_pkg.py
index a82c20ec..93520747 100644
--- a/slpkg/auto_pkg.py
+++ b/slpkg/auto_pkg.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # auto_pkg.py file is part of slpkg.
@@ -60,15 +60,15 @@ class Auto(object):
                 self.meta.color["ENDC"]))
         self.msg.template(78)
         try:
-            self.choice = raw_input(" > ")
+            self.choice = input(" > ")
         except EOFError:
             print("")
             raise SystemExit()
         if self.choice in self.commands.keys():
-            sys.stdout.write("   \x1b[1A{0}{1}{2}\n\n".format(
+            print("   \x1b[1A{0}{1}{2}\n\n".format(
                 self.meta.color["CYAN"], self.commands[self.choice],
-                self.meta.color["ENDC"]))
-            sys.stdout.flush()
+                self.meta.color["ENDC"]), end="")
+            print(end="", flush=True)
         self.execute()
 
     def execute(self):
diff --git a/slpkg/binary/check.py b/slpkg/binary/check.py
index cd6c6910..d6c14459 100644
--- a/slpkg/binary/check.py
+++ b/slpkg/binary/check.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # check.py file is part of slpkg.
@@ -22,7 +22,7 @@
 # along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 
-from distutils.version import LooseVersion
+from pkg_resources import parse_version
 
 from slpkg.messages import Msg
 from slpkg.toolbar import status
@@ -54,7 +54,7 @@ def pkg_upgrade(repo, skip, flag):
             if name:    # this tips because some pkg_name is empty
                 repo_pkg = split_package(name[:-4])
             if (repo_pkg[0] == inst_pkg[0] and
-                LooseVersion(repo_pkg[1]) > LooseVersion(inst_pkg[1]) and
+                parse_version(repo_pkg[1]) > parse_version(inst_pkg[1]) and
                 repo_pkg[3] >= inst_pkg[3] and
                     inst_pkg[0] not in skip and
                     repo_pkg[1] != "blacklist"):
diff --git a/slpkg/binary/dependency.py b/slpkg/binary/dependency.py
index cecab35e..9461dc9f 100644
--- a/slpkg/binary/dependency.py
+++ b/slpkg/binary/dependency.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # dependency.py file is part of slpkg.
diff --git a/slpkg/binary/greps.py b/slpkg/binary/greps.py
index 9aa52167..38988cc1 100644
--- a/slpkg/binary/greps.py
+++ b/slpkg/binary/greps.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # greps.py file is part of slpkg.
diff --git a/slpkg/binary/install.py b/slpkg/binary/install.py
index 2a760e88..4db3605d 100644
--- a/slpkg/binary/install.py
+++ b/slpkg/binary/install.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # install.py file is part of slpkg.
@@ -23,7 +23,7 @@
 
 
 import os
-from distutils.version import LooseVersion
+from pkg_resources import parse_version
 
 from slpkg.utils import Utils
 from slpkg.sizes import units
@@ -192,7 +192,7 @@ class BinaryInstall(object):
             data_dict = Utils().case_sensitive(data)
             for pkg in self.packages:
                 index = self.packages.index(pkg)
-                for key, value in data_dict.iteritems():
+                for key, value in data_dict.items():
                     if key == pkg.lower():
                         self.packages[index] = value
 
@@ -247,7 +247,7 @@ class BinaryInstall(object):
         ins_ver = GetFromInstalled(name).version()[1:]
         if not ins_ver:
             ins_ver = "0"
-        if LooseVersion(rep_ver) < LooseVersion(ins_ver):
+        if parse_version(rep_ver) < parse_version(ins_ver):
             self.msg.template(78)
             print("| Package {0} don't downgrade, "
                   "setting by user".format(name))
@@ -308,7 +308,7 @@ class BinaryInstall(object):
                 " " * (18-len(pkg_repo[1])), pkg_repo[2],
                 " " * (8-len(pkg_repo[2])), pkg_repo[3],
                 " " * (7-len(pkg_repo[3])), repo,
-                comp, " K")).rstrip()
+                comp, " K").rstrip())
         return [pkg_sum, upg_sum, uni_sum]
 
     def top_view(self):
diff --git a/slpkg/binary/repo_init.py b/slpkg/binary/repo_init.py
index 53e29854..a6d47e5a 100644
--- a/slpkg/binary/repo_init.py
+++ b/slpkg/binary/repo_init.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # repo_init.py file is part of slpkg.
diff --git a/slpkg/binary/search.py b/slpkg/binary/search.py
index fc50b673..a5526bc1 100644
--- a/slpkg/binary/search.py
+++ b/slpkg/binary/search.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # search.py file is part of slpkg.
diff --git a/slpkg/blacklist.py b/slpkg/blacklist.py
index d87b5916..1675985a 100644
--- a/slpkg/blacklist.py
+++ b/slpkg/blacklist.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # blacklist.py file is part of slpkg.
diff --git a/slpkg/checks.py b/slpkg/checks.py
index 887763e6..60b187f2 100644
--- a/slpkg/checks.py
+++ b/slpkg/checks.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # checks.py file is part of slpkg.
diff --git a/slpkg/checksum.py b/slpkg/checksum.py
index a35daa75..685a91c0 100644
--- a/slpkg/checksum.py
+++ b/slpkg/checksum.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # checksum.py file is part of slpkg.
diff --git a/slpkg/clean.py b/slpkg/clean.py
index 894a0a10..4bea6610 100644
--- a/slpkg/clean.py
+++ b/slpkg/clean.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # clean.py file is part of slpkg.
diff --git a/slpkg/config.py b/slpkg/config.py
index 37f08a45..744f1b4c 100644
--- a/slpkg/config.py
+++ b/slpkg/config.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # config.py file is part of slpkg.
diff --git a/slpkg/desc.py b/slpkg/desc.py
index c1e9c9a1..73f78946 100644
--- a/slpkg/desc.py
+++ b/slpkg/desc.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # desc.py file is part of slpkg.
diff --git a/slpkg/dialog_box.py b/slpkg/dialog_box.py
index 4fe32a7a..1932e98b 100644
--- a/slpkg/dialog_box.py
+++ b/slpkg/dialog_box.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # dialog_box.py file is part of slpkg.
diff --git a/slpkg/downloader.py b/slpkg/downloader.py
index 4c41dea8..d15d0079 100644
--- a/slpkg/downloader.py
+++ b/slpkg/downloader.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # downloader.py file is part of slpkg.
diff --git a/slpkg/file_size.py b/slpkg/file_size.py
index 3d63c155..f5b80859 100644
--- a/slpkg/file_size.py
+++ b/slpkg/file_size.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*
 
 # file_size.py file is part of slpkg.
@@ -23,7 +23,8 @@
 
 
 import os
-import urllib2
+import urllib
+from urllib.request import urlopen
 
 
 class FileSize(object):
@@ -36,10 +37,10 @@ class FileSize(object):
         """Returns the size of remote files
         """
         try:
-            tar = urllib2.urlopen(self.registry)
+            tar = urlopen(self.registry)
             meta = tar.info()
-            return int(meta.getheaders("Content-Length")[0])
-        except (urllib2.URLError, IndexError):
+            return int(meta.get_all("Content-Length")[0])
+        except (urllib.error.URLError, IndexError):
             return " "
 
     def local(self):
diff --git a/slpkg/graph.py b/slpkg/graph.py
index 5d115413..d874c4ac 100644
--- a/slpkg/graph.py
+++ b/slpkg/graph.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # graph.py file is part of slpkg.
diff --git a/slpkg/grep_md5.py b/slpkg/grep_md5.py
index 552e2194..6168dd8b 100644
--- a/slpkg/grep_md5.py
+++ b/slpkg/grep_md5.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # grep_md5.py file is part of slpkg.
diff --git a/slpkg/health.py b/slpkg/health.py
index 9fa844c6..011cb84e 100644
--- a/slpkg/health.py
+++ b/slpkg/health.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # health.py file is part of slpkg.
diff --git a/slpkg/init.py b/slpkg/init.py
index c0a37fea..20ce4320 100644
--- a/slpkg/init.py
+++ b/slpkg/init.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # init.py file is part of slpkg.
@@ -23,7 +23,6 @@
 
 
 import os
-import sys
 import shutil
 
 from slpkg.repositories import Repo
@@ -770,21 +769,21 @@ class Update(object):
         for repo in enabled:
             if check_for_local_repos(repo) is True:
                 continue
-            sys.stdout.write("{0}Check repository [{1}{2}{3}] ... "
+            print("{0}Check repository [{1}{2}{3}] ... "
                              "{4}".format(
                                     self.meta.color["GREY"],
                                     self.meta.color["CYAN"], repo,
                                     self.meta.color["GREY"],
-                                    self.meta.color["ENDC"]))
-            sys.stdout.flush()
+                                    self.meta.color["ENDC"]), end="")
+            print(end="", flush=True)
             if repo in default:
                 exec("{0}.{1}()".format(self._init, repo))
-                sys.stdout.write(self.done)
+                print(self.done, end="")
             elif repo in enabled:
                 Initialization(False).custom(repo)
-                sys.stdout.write(self.done)
+                print(self.done, end="")
             else:
-                sys.stdout.write(self.error)
+                print(self.error, end="")
         print("")   # new line at end
         raise SystemExit()
 
diff --git a/slpkg/load.py b/slpkg/load.py
index 65f86bb3..119dc21c 100644
--- a/slpkg/load.py
+++ b/slpkg/load.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # load.py file is part of slpkg.
diff --git a/slpkg/log_deps.py b/slpkg/log_deps.py
index 5ba7cc80..7ddac2c1 100644
--- a/slpkg/log_deps.py
+++ b/slpkg/log_deps.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # log_deps.py file is part of slpkg.
@@ -33,7 +33,7 @@ def write_deps(deps_dict):
     """Write dependencies in a log file
     into directory `/var/log/slpkg/dep/`
     """
-    for name, dependencies in deps_dict.iteritems():
+    for name, dependencies in deps_dict.items():
         if find_package(name + _meta_.sp, _meta_.pkg_path):
             dep_path = _meta_.log_path + "dep/"
             if not os.path.exists(dep_path):
diff --git a/slpkg/main.py b/slpkg/main.py
index af65d78b..464e37a6 100644
--- a/slpkg/main.py
+++ b/slpkg/main.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # main.py file is part of slpkg.
diff --git a/slpkg/md5sum.py b/slpkg/md5sum.py
index 716cb3f9..3d2c71ab 100644
--- a/slpkg/md5sum.py
+++ b/slpkg/md5sum.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # md5sum.py file is part of slpkg.
@@ -30,6 +30,6 @@ def md5(source):
     """
     # fix passing char '+' from source
     source = source.replace("%2B", "+")
-    with open(source) as file_to_check:
+    with open(source, "rb") as file_to_check:
         data = file_to_check.read()
         return hashlib.md5(data).hexdigest()
diff --git a/slpkg/messages.py b/slpkg/messages.py
index e3fcc937..ac59f1e9 100644
--- a/slpkg/messages.py
+++ b/slpkg/messages.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # messages.py file is part of slpkg.
@@ -22,7 +22,6 @@
 # along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 
-import sys
 import itertools
 
 from slpkg.__metadata__ import MetaData as _meta_
@@ -70,29 +69,29 @@ class Msg(object):
     def checking(self):
         """Message checking
         """
-        sys.stdout.write("{0}Checking...{1}  ".format(self.meta.color["GREY"],
-                                                      self.meta.color["ENDC"]))
-        sys.stdout.flush()
+        print("{0}Checking...{1}  ".format(self.meta.color["GREY"],
+                                           self.meta.color["ENDC"]), end="")
+        print(end="", flush=True)
 
     def reading(self):
         """Message reading
         """
-        sys.stdout.write("{0}Reading package lists...{1}  ".format(
-            self.meta.color["GREY"], self.meta.color["ENDC"]))
-        sys.stdout.flush()
+        print("{0}Reading package lists...{1}  ".format(
+            self.meta.color["GREY"], self.meta.color["ENDC"]), end="")
+        print(end="", flush=True)
 
     def resolving(self):
         """Message resolving
         """
-        sys.stdout.write("{0}Resolving dependencies...{1}  ".format(
-            self.meta.color["GREY"], self.meta.color["ENDC"]))
-        sys.stdout.flush()
+        print("{0}Resolving dependencies...{1}  ".format(
+            self.meta.color["GREY"], self.meta.color["ENDC"]), end="")
+        print(end="", flush=True)
 
     def done(self):
         """Message done
         """
-        sys.stdout.write("\b{0}Done{1}\n".format(self.meta.color["GREY"],
-                                                 self.meta.color["ENDC"]))
+        print("\b{0}Done{1}\n".format(self.meta.color["GREY"],
+                                      self.meta.color["ENDC"]), end="")
 
     def pkg(self, count):
         """Print singular plural
@@ -125,7 +124,7 @@ class Msg(object):
             answer = self.meta.default_answer
         else:
             try:
-                answer = raw_input("Would you like to continue [y/N]? ")
+                answer = input("Would you like to continue [y/N]? ")
             except EOFError:
                 print("")
                 raise SystemExit()
@@ -154,7 +153,7 @@ class Msg(object):
             len(install), self.pkg(len(install)),
             len(upgrade), self.pkg(len(upgrade))))
         self.template(78)
-        for installed, upgraded in itertools.izip_longest(install, upgrade):
+        for installed, upgraded in itertools.zip_longest(install, upgrade):
             if upgraded:
                 print("| Package {0} upgraded successfully".format(upgraded))
             if installed:
diff --git a/slpkg/new_config.py b/slpkg/new_config.py
index 0c552578..97382316 100644
--- a/slpkg/new_config.py
+++ b/slpkg/new_config.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # new_config.py file is part of slpkg.
@@ -88,7 +88,7 @@ class NewConfig(object):
         print("| {0}Q{1}{2}uit from menu".format(self.red, self.endc, self.br))
         self.msg.template(78)
         try:
-            choose = raw_input("\nWhat would you like to do [K/O/R/P/Q]? ")
+            choose = input("\nWhat would you like to do [K/O/R/P/Q]? ")
         except EOFError:
             print("")
             raise SystemExit()
@@ -141,7 +141,7 @@ class NewConfig(object):
         """Choose what do to file by file
         """
         print("")
-        prompt_ask = raw_input("{0} [K/O/R/D/M/Q]? ".format(n))
+        prompt_ask = input("{0} [K/O/R/D/M/Q]? ".format(n))
         print("")
         if prompt_ask in ("K", "k"):
             self.keep()
diff --git a/slpkg/pkg/build.py b/slpkg/pkg/build.py
index 78847acf..018627ab 100644
--- a/slpkg/pkg/build.py
+++ b/slpkg/pkg/build.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # build.py file is part of slpkg.
@@ -75,7 +75,7 @@ class BuildPackage(object):
             try:
                 tar = tarfile.open(self.script)
             except Exception as err:
-                print err
+                print(err)
                 raise SystemExit()
             tar.extractall()
             tar.close()
diff --git a/slpkg/pkg/find.py b/slpkg/pkg/find.py
index 858b4b00..0bacbaa1 100644
--- a/slpkg/pkg/find.py
+++ b/slpkg/pkg/find.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # find.py file is part of slpkg.
diff --git a/slpkg/pkg/installed.py b/slpkg/pkg/installed.py
index 861e3854..b924e721 100644
--- a/slpkg/pkg/installed.py
+++ b/slpkg/pkg/installed.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*
 
 # installed.py file is part of slpkg.
diff --git a/slpkg/pkg/manager.py b/slpkg/pkg/manager.py
index 86456275..fc469c61 100644
--- a/slpkg/pkg/manager.py
+++ b/slpkg/pkg/manager.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # manager.py file is part of slpkg.
@@ -108,7 +108,7 @@ class PackageManager(object):
                 if self.meta.default_answer in ["y", "Y"]:
                     remove_pkg = self.meta.default_answer
                 else:
-                    remove_pkg = raw_input(
+                    remove_pkg = input(
                         "\nAre you sure to remove {0} {1} [y/N]? ".format(
                             str(len(self.removed)), msg))
             except EOFError:
@@ -144,7 +144,7 @@ class PackageManager(object):
             remove_dep = self.meta.remove_deps_answer
         else:
             try:
-                remove_dep = raw_input(
+                remove_dep = input(
                     "\nRemove dependencies (maybe used by "
                     "other packages) [y/N]? ")
                 print("")
@@ -223,8 +223,8 @@ class PackageManager(object):
         if "--third-party" in self.extra:
             print("\n")
             self.msg.template(78)
-            print("| {0}{1}*** WARNING ***{2}").format(
-                " " * 27, self.meta.color["RED"], self.meta.color["ENDC"])
+            print(("| {0}{1}*** WARNING ***{2}").format(
+                " " * 27, self.meta.color["RED"], self.meta.color["ENDC"]))
             print("| Before you use third-party option, be sure you have"
                   " updated the packages \n| lists. Run the command"
                   " 'slpkg update' and 'slpkg -c slack --upgrade'")
@@ -337,7 +337,7 @@ class PackageManager(object):
             print("| Insert packages to exception remove:")
             self.msg.template(78)
             try:
-                self.skip = raw_input(" > ").split()
+                self.skip = input(" > ").split()
             except EOFError:
                 print("")
                 raise SystemExit()
@@ -519,7 +519,7 @@ class PackageManager(object):
                         self.meta.color["GREY"], index,
                         self.meta.color["ENDC"], pkg))
                     if index == page:
-                        read = raw_input("\nPress {0}Enter{1} to "
+                        read = input("\nPress {0}Enter{1} to "
                                          "continue... ".format(
                                              self.meta.color["CYAN"],
                                              self.meta.color["ENDC"]))
diff --git a/slpkg/pkg_find.py b/slpkg/pkg_find.py
index ee21f05f..af197e01 100644
--- a/slpkg/pkg_find.py
+++ b/slpkg/pkg_find.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # pkg_find.py file is part of slpkg.
diff --git a/slpkg/remove.py b/slpkg/remove.py
index 906974a5..c8d8fea4 100644
--- a/slpkg/remove.py
+++ b/slpkg/remove.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # remove.py file is part of slpkg.
diff --git a/slpkg/repoenable.py b/slpkg/repoenable.py
index 7be80758..6c5dde1d 100644
--- a/slpkg/repoenable.py
+++ b/slpkg/repoenable.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # repoenable.py file is part of slpkg.
diff --git a/slpkg/repoinfo.py b/slpkg/repoinfo.py
index ba20ebf2..e98c4066 100644
--- a/slpkg/repoinfo.py
+++ b/slpkg/repoinfo.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # repoinfo.py file is part of slpkg.
@@ -99,8 +99,8 @@ class RepoInfo(object):
             self.form["Status:"] = status
             self.form["Last updated:"] = last_upd
         print("")
-        for key, value in sorted(self.form.iteritems()):
-            print self.meta.color["GREY"] + key + self.meta.color["ENDC"], value
+        for key, value in sorted(self.form.items()):
+            print(self.meta.color["GREY"] + key + self.meta.color["ENDC"], value)
         print("")
         raise SystemExit()
 
diff --git a/slpkg/repolist.py b/slpkg/repolist.py
index 3bb0c807..aa74dce8 100644
--- a/slpkg/repolist.py
+++ b/slpkg/repolist.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # repolist.py file is part of slpkg.
@@ -49,7 +49,7 @@ class RepoList(object):
             "Default", " " * 3,
             "Status"))
         self.msg.template(78)
-        for repo_id, repo_URL in sorted(self.all_repos.iteritems()):
+        for repo_id, repo_URL in sorted(self.all_repos.items()):
             status, COLOR = "disabled", self.meta.color["RED"]
             default = "yes"
             if len(repo_URL) > 49:
diff --git a/slpkg/repositories.py b/slpkg/repositories.py
index ab58ab00..44170ed1 100644
--- a/slpkg/repositories.py
+++ b/slpkg/repositories.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # repositories.py file is part of slpkg.
diff --git a/slpkg/sbo/autobuild.py b/slpkg/sbo/autobuild.py
index 6e1c70ef..e5b04b18 100644
--- a/slpkg/sbo/autobuild.py
+++ b/slpkg/sbo/autobuild.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # autobuild.py file is part of slpkg.
diff --git a/slpkg/sbo/build_num.py b/slpkg/sbo/build_num.py
index 9bd66a13..6eb75738 100644
--- a/slpkg/sbo/build_num.py
+++ b/slpkg/sbo/build_num.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # build_num.py file is part of slpkg.
diff --git a/slpkg/sbo/check.py b/slpkg/sbo/check.py
index 5d6129fe..b0e39a9d 100644
--- a/slpkg/sbo/check.py
+++ b/slpkg/sbo/check.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # check.py file is part of slpkg.
@@ -23,7 +23,7 @@
 
 
 import os
-from distutils.version import LooseVersion
+from pkg_resources import parse_version
 
 from slpkg.messages import Msg
 from slpkg.toolbar import status
@@ -49,7 +49,7 @@ def sbo_upgrade(skip, flag):
         if (name in data and name not in skip and name not in blacklist):
             sbo_package = ("{0}-{1}".format(name, SBoGrep(name).version()))
             package = ("{0}-{1}".format(name, ver))
-            if LooseVersion(sbo_package) > LooseVersion(package):
+            if parse_version(sbo_package) > parse_version(package):
                 upgrade_names.append(name)
     Msg().done()
     if "--checklist" in flag:
diff --git a/slpkg/sbo/compressed.py b/slpkg/sbo/compressed.py
index 98917d29..637c17d2 100644
--- a/slpkg/sbo/compressed.py
+++ b/slpkg/sbo/compressed.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # download.py file is part of slpkg.
diff --git a/slpkg/sbo/dependency.py b/slpkg/sbo/dependency.py
index c12550d7..9535d314 100644
--- a/slpkg/sbo/dependency.py
+++ b/slpkg/sbo/dependency.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # dependency.py file is part of slpkg.
diff --git a/slpkg/sbo/greps.py b/slpkg/sbo/greps.py
index 03ffae28..d987971c 100644
--- a/slpkg/sbo/greps.py
+++ b/slpkg/sbo/greps.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # greps.py file is part of slpkg.
diff --git a/slpkg/sbo/network.py b/slpkg/sbo/network.py
index d2e6dffc..e9dcaec6 100644
--- a/slpkg/sbo/network.py
+++ b/slpkg/sbo/network.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # network.py file is part of slpkg.
@@ -137,7 +137,7 @@ class SBoNetwork(object):
         """
         if "--case-ins" in self.flag:
             data_dict = Utils().case_sensitive(self.data)
-            for key, value in data_dict.iteritems():
+            for key, value in data_dict.items():
                 if key == self.name.lower():
                     self.name = value
 
@@ -171,16 +171,16 @@ class SBoNetwork(object):
         }
         try:
             message = "  Choose an option > "
-            self.choice = raw_input("{0}{1}{2}".format(self.grey, message,
+            self.choice = input("{0}{1}{2}".format(self.grey, message,
                                                        self.endc))
         except EOFError:
             print("")
             raise SystemExit()
         try:
-            sys.stdout.write("{0}\x1b[1A{1}{2}{3}\n".format(
+            print("{0}\x1b[1A{1}{2}{3}\n".format(
                 " " * len(message), self.cyan, commands[self.choice],
-                self.endc))
-            sys.stdout.flush()
+                self.endc), end="")
+            print(end="", flush=True)
         except KeyError:
             pass
 
diff --git a/slpkg/sbo/queue.py b/slpkg/sbo/queue.py
index 7649ff88..eef9f5a5 100644
--- a/slpkg/sbo/queue.py
+++ b/slpkg/sbo/queue.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # queue.py file is part of slpkg.
diff --git a/slpkg/sbo/read.py b/slpkg/sbo/read.py
index 61719003..72d55b5c 100644
--- a/slpkg/sbo/read.py
+++ b/slpkg/sbo/read.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # read.py file is part of slpkg.
diff --git a/slpkg/sbo/sbo_arch.py b/slpkg/sbo/sbo_arch.py
index c20a1f3a..9e0f6b3a 100644
--- a/slpkg/sbo/sbo_arch.py
+++ b/slpkg/sbo/sbo_arch.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # sbo_arch.py file is part of slpkg.
diff --git a/slpkg/sbo/search.py b/slpkg/sbo/search.py
index 0fed1e95..5eefe4a2 100644
--- a/slpkg/sbo/search.py
+++ b/slpkg/sbo/search.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # search.py file is part of slpkg.
diff --git a/slpkg/sbo/slack_find.py b/slpkg/sbo/slack_find.py
index 4b242063..5001ab88 100644
--- a/slpkg/sbo/slack_find.py
+++ b/slpkg/sbo/slack_find.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # slack_find.py file is part of slpkg.
@@ -22,7 +22,7 @@
 # along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 
-from distutils.version import LooseVersion
+from pkg_resources import parse_version
 
 from slpkg.messages import Msg
 from slpkg.__metadata__ import MetaData as _meta_
@@ -38,7 +38,8 @@ def slack_package(prgnam):
         if pkg.startswith(prgnam) and pkg[:-4].endswith("_SBo"):
             binaries.append(pkg)
     for bins in binaries:
-        if LooseVersion(bins) > LooseVersion(cache):
+        binary = bins
+        if parse_version(bins) > parse_version(cache):
             binary = bins
             cache = binary
     if not binary:
diff --git a/slpkg/sbo/slackbuild.py b/slpkg/sbo/slackbuild.py
index 06143ae7..2a939340 100644
--- a/slpkg/sbo/slackbuild.py
+++ b/slpkg/sbo/slackbuild.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # slackbuild.py file is part of slpkg.
@@ -23,7 +23,7 @@
 
 
 import os
-from distutils.version import LooseVersion
+from pkg_resources import parse_version
 
 
 from slpkg.utils import Utils
@@ -171,7 +171,7 @@ class SBoInstall(object):
             data_dict = Utils().case_sensitive(self.data)
             for name in self.slackbuilds:
                 index = self.slackbuilds.index(name)
-                for key, value in data_dict.iteritems():
+                for key, value in data_dict.items():
                     if key == name.lower():
                         self.slackbuilds[index] = value
 
@@ -272,7 +272,7 @@ class SBoInstall(object):
             " " * (23-len(args[1] + ver)), args[2],
             " " * (18-len(args[2])), args[3],
             " " * (15-len(args[3])), "",
-            "", "SBo", "", "")).rstrip()
+            "", "SBo", "", "").rstrip())
 
     def tag(self, sbo):
         """Tag with color green if package already installed,
@@ -382,7 +382,7 @@ class SBoInstall(object):
         ins_ver = GetFromInstalled(name).version()[1:]
         if not ins_ver:
             ins_ver = "0"
-        if LooseVersion(sbo_ver) < LooseVersion(ins_ver):
+        if parse_version(sbo_ver) < parse_version(ins_ver):
             self.msg.template(78)
             print("| Package {0} don't downgrade, "
                   "setting by user".format(name))
diff --git a/slpkg/security.py b/slpkg/security.py
index 6ceee5b5..e7bcbcd1 100644
--- a/slpkg/security.py
+++ b/slpkg/security.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # security.py file is part of slpkg.
diff --git a/slpkg/sizes.py b/slpkg/sizes.py
index 98dd0cd0..ec55678a 100644
--- a/slpkg/sizes.py
+++ b/slpkg/sizes.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # sizes.py file is part of slpkg.
diff --git a/slpkg/slack/mirrors.py b/slpkg/slack/mirrors.py
index 38956227..3de98493 100644
--- a/slpkg/slack/mirrors.py
+++ b/slpkg/slack/mirrors.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # mirrors.py file is part of slpkg.
diff --git a/slpkg/slack/patches.py b/slpkg/slack/patches.py
index a446825e..f052ed7c 100644
--- a/slpkg/slack/patches.py
+++ b/slpkg/slack/patches.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # patches.py file is part of slpkg.
@@ -105,7 +105,7 @@ class Patches(object):
             print("{0}Total {1} {2} will be upgraded and {3} will be "
                   "installed.".format(self.meta.color["GREY"],
                                       self.count_upg,
-                                      self.msg.pkg(self.upgrade_all),
+                                      self.msg.pkg(len(self.upgrade_all)),
                                       self.count_added))
             print("Need to get {0} {1} of archives.".format(size[0],
                                                             unit[0]))
@@ -201,7 +201,7 @@ class Patches(object):
                 " " * (18-len(pkg_repo[1])), pkg_repo[2],
                 " " * (8-len(pkg_repo[2])), pkg_repo[3],
                 " " * (7-len(pkg_repo[3])), "Slack",
-                size, " K")).rstrip()
+                size, " K").rstrip())
 
     def upgrade(self):
         """
@@ -246,7 +246,7 @@ class Patches(object):
                     print("| L=lilo / E=elilo / G=grub")
                     self.msg.template(78)
                     try:
-                        answer = raw_input("\nThe kernel has been upgraded, "
+                        answer = input("\nThe kernel has been upgraded, "
                                            "reinstall boot loader [L/E/G]? ")
                     except EOFError:
                         print("")
diff --git a/slpkg/slack/slack_version.py b/slpkg/slack/slack_version.py
index 26e456ea..02dc2904 100644
--- a/slpkg/slack/slack_version.py
+++ b/slpkg/slack/slack_version.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # slack_version.py file is part of slpkg.
diff --git a/slpkg/slack/slackware_repo.py b/slpkg/slack/slackware_repo.py
index ae88b4fa..65a0b2ec 100644
--- a/slpkg/slack/slackware_repo.py
+++ b/slpkg/slack/slackware_repo.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # slackware_repo.py file is part of slpkg.
diff --git a/slpkg/slpkg_update.py b/slpkg/slpkg_update.py
index a30775e9..fa2f9987 100644
--- a/slpkg/slpkg_update.py
+++ b/slpkg/slpkg_update.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # slpkg_update.py file is part of slpkg.
@@ -59,7 +59,7 @@ def it_self_update():
             print("\nNew version '{0}-{1}' is available !\n".format(
                 _meta_.__all__, __new_version__))
             try:
-                answer = raw_input("Would you like to upgrade [y/N]? ")
+                answer = input("Would you like to upgrade [y/N]? ")
             except EOFError:
                 print("")
                 raise SystemExit()
diff --git a/slpkg/splitting.py b/slpkg/splitting.py
index 50e28e1f..56d8bfbb 100644
--- a/slpkg/splitting.py
+++ b/slpkg/splitting.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # splitting.py file is part of slpkg.
diff --git a/slpkg/status_deps.py b/slpkg/status_deps.py
index bcc4cafc..a275f68f 100644
--- a/slpkg/status_deps.py
+++ b/slpkg/status_deps.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # status_deps.py file is part of slpkg.
@@ -89,7 +89,7 @@ class DependenciesStatus(object):
         self.msg.template(78)
         print("| {0}{1}{2}".format("Dependencies", " " * 20, "Packages"))
         self.msg.template(78)
-        for key, value in self.dmap.iteritems():
+        for key, value in self.dmap.items():
             print("  {0}{1}{2}{3}{4}".format(
                 self.green, key, self.endc, " " * (32-len(key)),
                 ", ".join(value)))
@@ -105,14 +105,14 @@ class DependenciesStatus(object):
               "| -- Packages")
         self.msg.template(78)
         self.data()
-        for pkg, dep in self.dmap.iteritems():
+        for pkg, dep in self.dmap.items():
             print("+ {0}{1}{2}".format(self.green, pkg, self.endc))
             print("|")
             for d in dep:
                 print("+-- {0}".format(d))
                 print("|")
-            sys.stdout.write("\x1b[1A{0}\n".format(" "))
-            sys.stdout.flush()
+            print("\x1b[1A{0}\n".format(" "), end="")
+            print(end="", flush=True)
         self.summary()
         if self.image:
             Graph(self.image).dependencies(self.dmap)
diff --git a/slpkg/superuser.py b/slpkg/superuser.py
index 801789ec..6b2027b2 100644
--- a/slpkg/superuser.py
+++ b/slpkg/superuser.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # superuser.py file is part of slpkg.
diff --git a/slpkg/toolbar.py b/slpkg/toolbar.py
index 2b22b1ca..485030da 100644
--- a/slpkg/toolbar.py
+++ b/slpkg/toolbar.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # toolbar.py file is part of slpkg.
@@ -34,7 +34,7 @@ def status(sec):
     if _meta_.prg_bar in ["on", "ON"]:
         syms = ["|", "/", "-", "\\"]
         for sym in syms:
-            sys.stdout.write("\b{0}{1}{2}".format(_meta_.color["GREY"], sym,
-                                                  _meta_.color["ENDC"]))
-            sys.stdout.flush()
+            print("\b{0}{1}{2}".format(_meta_.color["GREY"], sym,
+                                       _meta_.color["ENDC"]), end="")
+            print(end="", flush=True)
             time.sleep(float(sec))
diff --git a/slpkg/tracking.py b/slpkg/tracking.py
index 01817108..fb090b84 100644
--- a/slpkg/tracking.py
+++ b/slpkg/tracking.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # tracking.py file is part of slpkg.
@@ -148,7 +148,7 @@ class TrackingDeps(object):
         if "--case-ins" in self.flag:
             data = SBoGrep(name="").names()
             data_dict = Utils().case_sensitive(data)
-            for key, value in data_dict.iteritems():
+            for key, value in data_dict.items():
                 if key == self.name.lower():
                     self.name = value
 
@@ -158,7 +158,7 @@ class TrackingDeps(object):
         """
         if "--case-ins" in self.flag:
             data_dict = Utils().case_sensitive(self.names)
-            for key, value in data_dict.iteritems():
+            for key, value in data_dict.items():
                 if key == self.name.lower():
                     self.name = value
 
diff --git a/slpkg/upgrade_checklist.py b/slpkg/upgrade_checklist.py
index 46673beb..34af366f 100644
--- a/slpkg/upgrade_checklist.py
+++ b/slpkg/upgrade_checklist.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # upgrade_checklist.py file is part of slpkg.
diff --git a/slpkg/url_read.py b/slpkg/url_read.py
index 3ca19875..8ce04e35 100644
--- a/slpkg/url_read.py
+++ b/slpkg/url_read.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # url_read.py file is part of slpkg.
@@ -22,8 +22,9 @@
 # along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 
-import os
-import urllib2
+# import os
+import urllib
+from urllib.request import urlopen
 
 from slpkg.__metadata__ import MetaData as _meta_
 
@@ -39,6 +40,7 @@ class URL(object):
         """Open url and read
         """
         try:
+            '''
             # testing proxy
             proxies = {}
             try:
@@ -54,11 +56,11 @@ class URL(object):
                 proxy = urllib2.ProxyHandler(proxies)
                 opener = urllib2.build_opener(proxy)
                 urllib2.install_opener(opener)
-
             # end testing
-            f = urllib2.urlopen(self.link)
-            return f.read()
-        except (urllib2.URLError, ValueError):
+            '''
+            f = urlopen(self.link)
+            return f.read().decode("utf-8")
+        except (urllib.error.URLError, ValueError):
             print("\n{0}Can't read the file '{1}'{2}".format(
                 self.meta.color["RED"], self.link.split("/")[-1],
                 self.meta.color["ENDC"]))
diff --git a/slpkg/utils.py b/slpkg/utils.py
index e762bff2..e423fabc 100644
--- a/slpkg/utils.py
+++ b/slpkg/utils.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # utils.py file is part of slpkg.
diff --git a/slpkg/version.py b/slpkg/version.py
index accd7dd0..8f4ee290 100644
--- a/slpkg/version.py
+++ b/slpkg/version.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # -*- coding: utf-8 -*-
 
 # version.py file is part of slpkg.