diff --git a/slpkg/__metadata__.py b/slpkg/__metadata__.py
index 0b0bb668..fd8d3d71 100644
--- a/slpkg/__metadata__.py
+++ b/slpkg/__metadata__.py
@@ -40,7 +40,7 @@ def update_repositories(repositories, conf_path):
     """
     Upadate with user custom repositories
     """
-    repo_file = "{0}custom-repositories".format(conf_path)
+    repo_file = f"{conf_path}custom-repositories"
     if os.path.isfile(repo_file):
         f = open(repo_file, "r")
         repositories_list = f.read()
@@ -90,11 +90,11 @@ class MetaData:
     slack_rel = "stable"
 
     # Configuration path
-    conf_path = "/etc/{0}/".format(__all__)
+    conf_path = f"/etc/{__all__}/"
 
     # tmp paths
     tmp = "/tmp/"
-    tmp_path = "{0}{1}/".format(tmp, __all__)
+    tmp_path = f"{tmp}{__all__}/"
 
     # Default configuration values
     _conf_slpkg = {
@@ -138,8 +138,8 @@ class MetaData:
     # read value from configuration file
     repositories = []
     for files in ["slpkg.conf", "repositories.conf"]:
-        if os.path.isfile("%s%s" % (conf_path, files)):
-            f = open("%s%s" % (conf_path, files), "r")
+        if os.path.isfile(f"{conf_path}{files}"):
+            f = open(f"{conf_path}{files}", "r")
             conf = f.read()
             f.close()
             for line in conf.splitlines():
@@ -217,8 +217,8 @@ class MetaData:
             "ENDC": ""
         }
 
-    CHECKSUMS_link = ("https://gitlab.com/{0}/{1}/raw/"
-                      "master/CHECKSUMS.md5".format(__author__, __all__))
+    CHECKSUMS_link = (f"https://gitlab.com/{__author__}/{__all__}/raw/"
+                      "master/CHECKSUMS.md5")
 
     # file spacer
     sp = "-"
diff --git a/slpkg/arguments.py b/slpkg/arguments.py
index c88907bf..75e972fd 100644
--- a/slpkg/arguments.py
+++ b/slpkg/arguments.py
@@ -30,8 +30,7 @@ from slpkg.slack.slack_version import slack_ver
 
 def header():
     """help header message"""
-    print("\nslpkg - version {0} | Slackware release: {1} - {2}\n".format(
-        _meta_.__version__, _meta_.slack_rel, slack_ver()))
+    print(f"\nslpkg - version {_meta_.__version__} | Slackware release: {_meta_.slack_rel} - {slack_ver()}\n")
 
 
 def options():
@@ -220,11 +219,11 @@ def usage(repo):
         all_repos = RepoList().all_repos.keys()
         del RepoList().all_repos
         if repo in all_repos:
-            error_repo = ("slpkg: Error: Repository '{0}' is not activated"
-                          "\n".format(repo))
+            error_repo = (f"slpkg: Error: Repository '{repo}' is not activated"
+                          "\n")
         else:
-            error_repo = ("slpkg: Error: Repository '{0}' does not exist"
-                          "\n".format(repo))
+            error_repo = (f"slpkg: Error: Repository '{repo}' does not exist"
+                          "\n")
         print("\n" + error_repo)
         raise SystemExit(1)
     print(usage.__doc__)
diff --git a/slpkg/auto_pkg.py b/slpkg/auto_pkg.py
index 8aba4190..698dad61 100644
--- a/slpkg/auto_pkg.py
+++ b/slpkg/auto_pkg.py
@@ -22,8 +22,6 @@
 # along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 
-import sys
-
 from slpkg.messages import Msg
 from slpkg.__metadata__ import MetaData as _meta_
 
@@ -36,6 +34,10 @@ class Auto:
     def __init__(self, packages):
         self.packages = packages
         self.meta = _meta_
+        self.green = _meta_.color["GREEN"]
+        self.red = _meta_.color["RED"]
+        self.cyan = _meta_.color["CYAN"]
+        self.endc = _meta_.color["ENDC"]
         self.msg = Msg()
         self.commands = {
             "i": "installpkg",
@@ -54,10 +56,7 @@ class Auto:
         print("| Choose a Slackware command:")
         self.msg.template(78)
         for com in sorted(self.commands):
-            print("| {0}{1}{2}) {3}{4}{5}".format(
-                self.meta.color["RED"], com, self.meta.color["ENDC"],
-                self.meta.color["GREEN"], self.commands[com],
-                self.meta.color["ENDC"]))
+            print(f"| {self.red}{com}{self.endc}) {self.green}{self.commands[com]}{self.endc}")
         self.msg.template(78)
         try:
             self.choice = input(" > ")
@@ -65,9 +64,7 @@ class Auto:
             print()
             raise SystemExit()
         if self.choice in self.commands.keys():
-            print("   \x1b[1A{0}{1}{2}\n\n".format(
-                self.meta.color["CYAN"], self.commands[self.choice],
-                self.meta.color["ENDC"]), end="")
+            print(f"   \x1b[1A{self.cyan}{self.commands[self.choice]}{self.endc}", end="\n\n")
             print(end="", flush=True)
         self.execute()
 
diff --git a/slpkg/blacklist.py b/slpkg/blacklist.py
index f6c6ff5b..59eb4058 100644
--- a/slpkg/blacklist.py
+++ b/slpkg/blacklist.py
@@ -33,8 +33,10 @@ class BlackList:
     """Blacklist class to add, remove or listed packages
     in blacklist file."""
     def __init__(self):
-        self.meta = _meta_
         self.quit = False
+        self.green = _meta_.color["GREEN"]
+        self.red = _meta_.color["RED"]
+        self.endc = _meta_.color["ENDC"]
         self.blackfile = "/etc/slpkg/blacklist"
         self.black_conf = ""
         if os.path.isfile(self.blackfile):
@@ -56,8 +58,7 @@ class BlackList:
         print("\nPackages in the blacklist:\n")
         for black in self.get_black():
             if black:
-                print("{0}{1}{2}".format(self.meta.color["GREEN"], black,
-                                         self.meta.color["ENDC"]))
+                print(f"{self.green}{black}{self.endc}")
                 self.quit = True
         if self.quit:
             print()   # new line at exit
@@ -71,8 +72,7 @@ class BlackList:
         with open(self.blackfile, "a") as black_conf:
             for pkg in pkgs:
                 if pkg not in blacklist:
-                    print("{0}{1}{2}".format(self.meta.color["GREEN"], pkg,
-                                             self.meta.color["ENDC"]))
+                    print(f"{self.green}{pkg}{self.endc}")
                     black_conf.write(pkg + "\n")
                     self.quit = True
             black_conf.close()
@@ -88,8 +88,7 @@ class BlackList:
                 if line not in pkgs:
                     remove.write(line + "\n")
                 else:
-                    print("{0}{1}{2}".format(self.meta.color["RED"], line,
-                                             self.meta.color["ENDC"]))
+                    print(f"{self.red}{line}{self.endc}")
                     self.quit = True
             remove.close()
         if self.quit: