diff --git a/jedi/_compatibility.py b/jedi/_compatibility.py
index 2002a1ca..6f42ddcd 100644
--- a/jedi/_compatibility.py
+++ b/jedi/_compatibility.py
@@ -207,6 +207,7 @@ def _iter_modules(paths, prefix=''):
                 yield importer, prefix + modname, ispkg
         # END COPY
 
+
 iter_modules = _iter_modules if py_version >= 34 else pkgutil.iter_modules
 
 
@@ -252,6 +253,7 @@ Usage::
 
 """
 
+
 class Python3Method(object):
     def __init__(self, func):
         self.func = func
@@ -312,10 +314,10 @@ def force_unicode(obj):
 try:
     import builtins  # module name in python 3
 except ImportError:
-    import __builtin__ as builtins
+    import __builtin__ as builtins  # noqa: F401
 
 
-import ast
+import ast  # noqa: F401
 
 
 def literal_eval(string):
@@ -325,7 +327,7 @@ def literal_eval(string):
 try:
     from itertools import zip_longest
 except ImportError:
-    from itertools import izip_longest as zip_longest  # Python 2
+    from itertools import izip_longest as zip_longest  # Python 2  # noqa: F401
 
 try:
     FileNotFoundError = FileNotFoundError
@@ -378,7 +380,7 @@ def utf8_repr(func):
 if is_py3:
     import queue
 else:
-    import Queue as queue
+    import Queue as queue  # noqa: F401
 
 try:
     # Attempt to load the C implementation of pickle on Python 2 as it is way
@@ -544,7 +546,7 @@ def which(cmd, mode=os.F_OK | os.X_OK, path=None):
 
     if sys.platform == "win32":
         # The current directory takes precedence on Windows.
-        if not os.curdir in path:
+        if os.curdir not in path:
             path.insert(0, os.curdir)
 
         # PATHEXT is necessary to check on Windows.
@@ -565,7 +567,7 @@ def which(cmd, mode=os.F_OK | os.X_OK, path=None):
     seen = set()
     for dir in path:
         normdir = os.path.normcase(dir)
-        if not normdir in seen:
+        if normdir not in seen:
             seen.add(normdir)
             for thefile in files:
                 name = os.path.join(dir, thefile)
diff --git a/jedi/debug.py b/jedi/debug.py
index a4fd8646..49fda4bc 100644
--- a/jedi/debug.py
+++ b/jedi/debug.py
@@ -2,16 +2,17 @@ from jedi._compatibility import encoding, is_py3, u
 import os
 import time
 
+_inited = False
+
+
 def _lazy_colorama_init():
     """
-    Lazily init colorama if necessary, not to screw up stdout is debug not
-    enabled.
+    Lazily init colorama if necessary, not to screw up stdout if debugging is
+    not enabled.
 
     This version of the function does nothing.
     """
-    pass
 
-_inited=False
 
 try:
     if os.name == 'nt':
@@ -21,7 +22,8 @@ try:
         # Use colorama for nicer console output.
         from colorama import Fore, init
         from colorama import initialise
-        def _lazy_colorama_init():
+
+        def _lazy_colorama_init():  # noqa: F811
             """
             Lazily init colorama if necessary, not to screw up stdout is
             debug not enabled.
diff --git a/jedi/utils.py b/jedi/utils.py
index 1338d1b3..04e87c30 100644
--- a/jedi/utils.py
+++ b/jedi/utils.py
@@ -113,7 +113,7 @@ def setup_readline(namespace_module=__main__):
         # this code. This didn't use to be an issue until 3.3. Starting with
         # 3.4 this is different, it always overwrites the completer if it's not
         # already imported here.
-        import rlcompleter
+        import rlcompleter  # noqa: F401
         import readline
     except ImportError:
         print("Jedi: Module readline not available.")
diff --git a/setup.cfg b/setup.cfg
index f312e562..96111b23 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -3,3 +3,6 @@ universal=1
 
 [flake8]
 max-line-length = 100
+ignore =
+  # do not use bare 'except'
+  E722,