diff --git a/.builds/debian.yml b/.builds/debian.yml
index d59afb2..e6a1cd9 100644
--- a/.builds/debian.yml
+++ b/.builds/debian.yml
@@ -31,7 +31,7 @@ tasks:
       # stop the build if there are Python syntax errors or undefined names
       poetry run flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
       # exit-zero treats all errors as warnings.
-      poetry run flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+      poetry run flake8 . --count --max-complexity=10 --max-line-length=127 --statistics
   - test: |
       export PATH="$PATH:/home/build/.local/bin"
       cd ${project}
diff --git a/.github/workflows/pythonapp.yaml b/.github/workflows/pythonapp.yaml
index 381ad75..196f3f8 100644
--- a/.github/workflows/pythonapp.yaml
+++ b/.github/workflows/pythonapp.yaml
@@ -29,7 +29,7 @@ jobs:
         # stop the build if there are Python syntax errors or undefined names
         poetry run flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
         # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
-        poetry run flake8 . --count --exit-zero --max-complexity=15 --max-line-length=127 --statistics
+        poetry run flake8 . --count --max-complexity=15 --max-line-length=127 --statistics
 
     - name: Test with pytest
       run: |
diff --git a/bin/lsb.py b/bin/lsb.py
index 1b09d2b..122bc26 100755
--- a/bin/lsb.py
+++ b/bin/lsb.py
@@ -56,7 +56,8 @@ class ValidateGenerator(argparse.Action):
 def main():
     parser = argparse.ArgumentParser(prog="stegano-lsb")
     subparsers = parser.add_subparsers(
-        help="sub-command help", dest="command", required=True)
+        help="sub-command help", dest="command", required=True
+    )
 
     # Subparser: Hide
     parser_hide = subparsers.add_parser("hide", help="hide help")
@@ -155,9 +156,7 @@ def main():
     )
 
     # Subparser: List generators
-    parser_list_generators = subparsers.add_parser(
-        "list-generators", help="list-generators help"
-    )
+    subparsers.add_parser("list-generators", help="list-generators help")
 
     arguments = parser.parse_args()
 
diff --git a/stegano/exifHeader/__init__.py b/stegano/exifHeader/__init__.py
index a64a46c..f6e672d 100644
--- a/stegano/exifHeader/__init__.py
+++ b/stegano/exifHeader/__init__.py
@@ -1,4 +1,6 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 
-from .exifHeader import *
+from .exifHeader import hide, reveal
+
+__all__ = ["hide", "reveal"]
diff --git a/stegano/lsb/__init__.py b/stegano/lsb/__init__.py
index 1ffc44a..72435f5 100644
--- a/stegano/lsb/__init__.py
+++ b/stegano/lsb/__init__.py
@@ -1,4 +1,6 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 
-from .lsb import *
+from .lsb import hide, reveal
+
+__all__ = ["hide", "reveal"]
diff --git a/stegano/red/__init__.py b/stegano/red/__init__.py
index d3c8604..83a8a84 100644
--- a/stegano/red/__init__.py
+++ b/stegano/red/__init__.py
@@ -1,4 +1,6 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 
-from .red import *
+from .red import hide, reveal
+
+__all__ = ["hide", "reveal"]
diff --git a/stegano/steganalysis/__init__.py b/stegano/steganalysis/__init__.py
index 239d66c..faa18be 100644
--- a/stegano/steganalysis/__init__.py
+++ b/stegano/steganalysis/__init__.py
@@ -1,5 +1,2 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
-
-from .parity import *
-from .statistics import *
diff --git a/stegano/tools.py b/stegano/tools.py
index 549c64d..f494dbc 100755
--- a/stegano/tools.py
+++ b/stegano/tools.py
@@ -209,7 +209,9 @@ class Revealer:
                         raise IndexError("Impossible to detect message.")
 
         if len(self._bitab) - len(str(self._limit)) - 1 == self._limit:
-            self.secret_message = "".join(self._bitab)[len(str(self._limit)) + 1 :]
+            self.secret_message = "".join(self._bitab)[
+                len(str(self._limit)) + 1 :  # noqa: E203
+            ]
             self.encoded_image.close()
 
             return True