Fix flake8 errors.

src/dotenv/compat.py

@@ -10,4 +10,4 @@
 if TYPE_CHECKING:
     text_type = Text  # type: Type[Text]
 else:
-    text_type = unicode if PY2 else str
+    text_type = unicode if PY2 else str  # noqa

src/dotenv/ipython.py

@@ -1,8 +1,8 @@
 from __future__ import print_function
 
-from IPython.core.magic import Magics, line_magic, magics_class # type: ignore
-from IPython.core.magic_arguments import (argument, magic_arguments, # type: ignore
-                                          parse_argstring) # type: ignore
+from IPython.core.magic import Magics, line_magic, magics_class  # type: ignore
+from IPython.core.magic_arguments import (argument, magic_arguments,  # type: ignore
+                                          parse_argstring)  # type: ignore
 
 from .main import find_dotenv, load_dotenv
 

src/dotenv/main.py

@@ -9,8 +9,8 @@
 import sys
 from subprocess import Popen
 import tempfile
-from typing import (Any, Dict, Iterator, List, Match, NamedTuple, Optional,
-                    Pattern, Union, TYPE_CHECKING, Text, IO, Tuple)
+from typing import (Any, Dict, Iterator, List, Match, NamedTuple, Optional,  # noqa
+                    Pattern, Union, TYPE_CHECKING, Text, IO, Tuple)  # noqa
 import warnings
 from collections import OrderedDict
 from contextlib import contextmanager
@@ -178,7 +178,7 @@ def get(self, key):
         if self.verbose:
             warnings.warn("key %s not found in %s." % (key, self.dotenv_path))  # type: ignore
 
-        return None # NOTE: PEP8 compliance required by mypy
+        return None
 
 
 def get_key(dotenv_path, key_to_get):