diff --git a/.coafile b/.coafile
index 9742deea91..f6256180b5 100644
--- a/.coafile
+++ b/.coafile
@@ -15,6 +15,14 @@ language = python
 default_actions = *: ApplyPatchAction
 preferred_quotation = '
 
+[flakes]
+# Do not set default_action to ApplyPatchAction as it may lead to some
+# required imports being removed which might result in coala behaving weirdly.
+default_action: *: ShowPatchAction
+bears = PyUnusedCodeBear
+language = Python
+remove_all_unused_imports = true
+
 [autopep8]
 bears = PEP8Bear, PycodestyleBear
 default_actions = PEP8Bear: ApplyPatchAction
diff --git a/bears/Constants.py b/bears/Constants.py
index 2a5216b4d2..9c9ad32f0a 100644
--- a/bears/Constants.py
+++ b/bears/Constants.py
@@ -1,6 +1,8 @@
 import os
 
+# Start ignoring PyUnusedCodeBear
 from bears import VERSION
+# Stop ignoring PyUnusedCodeBear
 
 # Path to the bears directory
 bears_root = os.path.dirname(__file__)
diff --git a/bears/c_languages/ClangBear.py b/bears/c_languages/ClangBear.py
index 69749b33a1..ab28375057 100644
--- a/bears/c_languages/ClangBear.py
+++ b/bears/c_languages/ClangBear.py
@@ -1,7 +1,6 @@
 from clang.cindex import Index, LibclangError
 
 from coalib.bears.LocalBear import LocalBear
-from dependency_management.requirements.PipRequirement import PipRequirement
 from coalib.results.Diff import Diff
 from coalib.results.Result import Result
 from coalib.results.RESULT_SEVERITY import RESULT_SEVERITY
diff --git a/bears/css/StyleLintBear.py b/bears/css/StyleLintBear.py
index 42aae579bc..86864d7b39 100644
--- a/bears/css/StyleLintBear.py
+++ b/bears/css/StyleLintBear.py
@@ -1,4 +1,3 @@
-import os
 import json
 from coalib.bearlib.abstractions.Linter import linter
 from dependency_management.requirements.NpmRequirement import NpmRequirement
diff --git a/bears/perl/PerlCriticBear.py b/bears/perl/PerlCriticBear.py
index 502062102f..ce00776860 100644
--- a/bears/perl/PerlCriticBear.py
+++ b/bears/perl/PerlCriticBear.py
@@ -1,5 +1,3 @@
-import platform
-
 from coalib.bearlib.abstractions.Linter import linter
 from dependency_management.requirements.DistributionRequirement import (
     DistributionRequirement)
diff --git a/bears/ruby/RubySyntaxBear.py b/bears/ruby/RubySyntaxBear.py
index 406b689c9c..53aee8991a 100644
--- a/bears/ruby/RubySyntaxBear.py
+++ b/bears/ruby/RubySyntaxBear.py
@@ -1,5 +1,4 @@
 from coalib.bearlib.abstractions.Linter import linter
-from dependency_management.requirements.GemRequirement import GemRequirement
 from dependency_management.requirements.DistributionRequirement import (
     DistributionRequirement)
 
diff --git a/tests/css/StyleLintBearTest.py b/tests/css/StyleLintBearTest.py
index 72b37b0162..30c286d3f3 100644
--- a/tests/css/StyleLintBearTest.py
+++ b/tests/css/StyleLintBearTest.py
@@ -1,5 +1,4 @@
 import os
-import re
 from queue import Queue
 from shutil import which
 from unittest.case import skipIf
@@ -7,7 +6,6 @@
 from bears.css.StyleLintBear import StyleLintBear
 from coalib.testing.LocalBearTestHelper import LocalBearTestHelper
 from coalib.settings.Section import Section
-from coalib.settings.Setting import Setting
 
 
 @skipIf(which('stylelint') is None, 'Stylelint is not installed')
diff --git a/tests/haskell/GhcModBearTest.py b/tests/haskell/GhcModBearTest.py
index 2ef88242ea..b52c59f789 100644
--- a/tests/haskell/GhcModBearTest.py
+++ b/tests/haskell/GhcModBearTest.py
@@ -2,10 +2,8 @@
 
 from bears.haskell.GhcModBear import GhcModBear
 from coalib.testing.LocalBearTestHelper import LocalBearTestHelper
-from coalib.testing.LocalBearTestHelper import verify_local_bear
 from coalib.testing.BearTestHelper import generate_skip_decorator
 from coalib.settings.Section import Section
-from coalib.settings.Setting import Setting
 
 
 # A simple hello world program!
diff --git a/tests/haskell/HaskellLintBearTest.py b/tests/haskell/HaskellLintBearTest.py
index 0dfd21201d..d0b40c9a35 100644
--- a/tests/haskell/HaskellLintBearTest.py
+++ b/tests/haskell/HaskellLintBearTest.py
@@ -2,10 +2,9 @@
 
 from bears.haskell.HaskellLintBear import HaskellLintBear
 from coalib.testing.LocalBearTestHelper import LocalBearTestHelper
-from coalib.testing.LocalBearTestHelper import verify_local_bear
 from coalib.testing.BearTestHelper import generate_skip_decorator
 from coalib.settings.Section import Section
-from coalib.settings.Setting import Setting
+
 
 good_single_line_file = """
 myconcat = (++)