diff --git a/pipreqs/pipreqs.py b/pipreqs/pipreqs.py
index df6cbff..7b1f7e5 100644
--- a/pipreqs/pipreqs.py
+++ b/pipreqs/pipreqs.py
@@ -38,28 +38,29 @@ Options:
                           <gt>     | e.g. Flask>=1.1.2
                           <no-pin> | e.g. Flask
 """
-from contextlib import contextmanager
-import os
-import sys
-import re
-import logging
 import ast
+import logging
+import os
+import re
+import sys
 import traceback
-from docopt import docopt
+from contextlib import contextmanager
+
 import requests
+from docopt import docopt
 from yarg import json2package
 from yarg.exceptions import HTTPError
 
 from pipreqs import __version__
 
 REGEXP = [
-    re.compile(r'^import (.+)$'),
-    re.compile(r'^from ((?!\.+).*?) import (?:.*)$')
+    re.compile(r"^import (.+)$"),
+    re.compile(r"^from ((?!\.+).*?) import (?:.*)$"),
 ]
 
 
 @contextmanager
-def _open(filename=None, mode='r'):
+def _open(filename=None, mode="r"):
     """Open a file or ``sys.stdout`` depending on the provided filename.
 
     Args:
@@ -72,13 +73,13 @@ def _open(filename=None, mode='r'):
         A file handle.
 
     """
-    if not filename or filename == '-':
-        if not mode or 'r' in mode:
+    if not filename or filename == "-":
+        if not mode or "r" in mode:
             file = sys.stdin
-        elif 'w' in mode:
+        elif "w" in mode:
             file = sys.stdout
         else:
-            raise ValueError('Invalid mode for file: {}'.format(mode))
+            raise ValueError("Invalid mode for file: {}".format(mode))
     else:
         file = open(filename, mode)
 
@@ -90,7 +91,8 @@ def _open(filename=None, mode='r'):
 
 
 def get_all_imports(
-        path, encoding=None, extra_ignore_dirs=None, follow_links=True):
+    path, encoding=None, extra_ignore_dirs=None, follow_links=True
+):
     imports = set()
     raw_imports = set()
     candidates = []
@@ -139,11 +141,11 @@ def get_all_imports(
         # Cleanup: We only want to first part of the import.
         # Ex: from django.conf --> django.conf. But we only want django
         # as an import.
-        cleaned_name, _, _ = name.partition('.')
+        cleaned_name, _, _ = name.partition(".")
         imports.add(cleaned_name)
 
     packages = imports - (set(candidates) & imports)
-    logging.debug('Found packages: {0}'.format(packages))
+    logging.debug("Found packages: {0}".format(packages))
 
     with open(join("stdlib"), "r") as f:
         data = {x.strip() for x in f}
@@ -157,42 +159,59 @@ def filter_line(line):
 
 def generate_requirements_file(path, imports, symbol):
     with _open(path, "w") as out_file:
-        logging.debug('Writing {num} requirements: {imports} to {file}'.format(
-            num=len(imports),
-            file=path,
-            imports=", ".join([x['name'] for x in imports])
-        ))
-        fmt = '{name}' + symbol + '{version}'
-        out_file.write('\n'.join(
-            fmt.format(**item) if item['version'] else '{name}'.format(**item)
-            for item in imports) + '\n')
+        logging.debug(
+            "Writing {num} requirements: {imports} to {file}".format(
+                num=len(imports),
+                file=path,
+                imports=", ".join([x["name"] for x in imports]),
+            )
+        )
+        fmt = "{name}" + symbol + "{version}"
+        out_file.write(
+            "\n".join(
+                fmt.format(**item)
+                if item["version"]
+                else "{name}".format(**item)
+                for item in imports
+            )
+            + "\n"
+        )
 
 
 def output_requirements(imports, symbol):
-    generate_requirements_file('-', imports, symbol)
+    generate_requirements_file("-", imports, symbol)
 
 
 def get_imports_info(
-        imports, pypi_server="https://pypi.python.org/pypi/", proxy=None, verify=None):
+    imports,
+    pypi_server="https://pypi.python.org/pypi/",
+    proxy=None,
+    verify=None,
+):
     result = []
 
     for item in imports:
         try:
             response = requests.get(
-                "{0}{1}/json".format(pypi_server, item), proxies=proxy, verify=verify)
+                "{0}{1}/json".format(pypi_server, item),
+                proxies=proxy,
+                verify=verify,
+            )
             if response.status_code == 200:
-                if hasattr(response.content, 'decode'):
+                if hasattr(response.content, "decode"):
                     data = json2package(response.content.decode())
                 else:
                     data = json2package(response.content)
             elif response.status_code >= 300:
-                raise HTTPError(status_code=response.status_code,
-                                reason=response.reason)
+                raise HTTPError(
+                    status_code=response.status_code, reason=response.reason
+                )
         except HTTPError:
             logging.debug(
-                'Package %s does not exist or network problems', item)
+                "Package %s does not exist or network problems", item
+            )
             continue
-        result.append({'name': item, 'version': data.latest_release_id})
+        result.append({"name": item, "version": data.latest_release_id})
     return result
 
 
@@ -212,16 +231,20 @@ def get_locally_installed_packages(encoding=None):
                             # TODO: What errors do we intend to suppress here?
                             continue
                         for i_item in package_import:
-                            if ((i_item not in ignore) and
-                                    (package[0] not in ignore)):
+                            if (i_item not in ignore) and (
+                                package[0] not in ignore
+                            ):
                                 version = None
                                 if len(package) > 1:
-                                    version = package[1].replace(
-                                        ".dist", "").replace(".egg", "")
+                                    version = (
+                                        package[1]
+                                        .replace(".dist", "")
+                                        .replace(".egg", "")
+                                    )
 
                                 packages[i_item] = {
-                                    'version': version,
-                                    'name': package[0]
+                                    "version": version,
+                                    "name": package[0],
                                 }
     return packages
 
@@ -234,12 +257,7 @@ def get_import_local(imports, encoding=None):
             result.append(local[item.lower()])
 
     # removing duplicates of package/version
-    result_unique = [
-        dict(t)
-        for t in set([
-            tuple(d.items()) for d in result
-        ])
-    ]
+    result_unique = [dict(t) for t in set([tuple(d.items()) for d in result])]
 
     return result_unique
 
@@ -270,7 +288,7 @@ def get_name_without_alias(name):
         match = REGEXP[0].match(name.strip())
         if match:
             name = match.groups(0)[0]
-    return name.partition(' as ')[0].partition('.')[0].strip()
+    return name.partition(" as ")[0].partition(".")[0].strip()
 
 
 def join(f):
@@ -356,7 +374,8 @@ def diff(file_, imports):
 
     logging.info(
         "The following modules are in {} but do not seem to be imported: "
-        "{}".format(file_, ", ".join(x for x in modules_not_imported)))
+        "{}".format(file_, ", ".join(x for x in modules_not_imported))
+    )
 
 
 def clean(file_, imports):
@@ -404,20 +423,22 @@ def dynamic_versioning(scheme, imports):
 
 
 def init(args):
-    encoding = args.get('--encoding')
-    extra_ignore_dirs = args.get('--ignore')
-    follow_links = not args.get('--no-follow-links')
-    input_path = args['<path>']
+    encoding = args.get("--encoding")
+    extra_ignore_dirs = args.get("--ignore")
+    follow_links = not args.get("--no-follow-links")
+    input_path = args["<path>"]
     if input_path is None:
         input_path = os.path.abspath(os.curdir)
 
     if extra_ignore_dirs:
-        extra_ignore_dirs = extra_ignore_dirs.split(',')
+        extra_ignore_dirs = extra_ignore_dirs.split(",")
 
-    candidates = get_all_imports(input_path,
-                                 encoding=encoding,
-                                 extra_ignore_dirs=extra_ignore_dirs,
-                                 follow_links=follow_links)
+    candidates = get_all_imports(
+        input_path,
+        encoding=encoding,
+        extra_ignore_dirs=extra_ignore_dirs,
+        follow_links=follow_links,
+    )
     candidates = get_pkg_names(candidates)
     logging.debug("Found imports: " + ", ".join(candidates))
     pypi_server = "https://pypi.python.org/pypi/"
@@ -427,30 +448,36 @@ def init(args):
         pypi_server = args["--pypi-server"]
 
     if args["--proxy"]:
-        proxy = {'http': args["--proxy"], 'https': args["--proxy"]}
+        proxy = {"http": args["--proxy"], "https": args["--proxy"]}
 
     if args["--verify"]:
         verify = args["--verify"]
 
     if args["--use-local"]:
         logging.debug(
-            "Getting package information ONLY from local installation.")
+            "Getting package information ONLY from local installation."
+        )
         imports = get_import_local(candidates, encoding=encoding)
     else:
         logging.debug("Getting packages information from Local/PyPI")
         local = get_import_local(candidates, encoding=encoding)
         # Get packages that were not found locally
-        difference = [x for x in candidates
-                      if x.lower() not in [z['name'].lower() for z in local]]
-        imports = local + get_imports_info(difference,
-                                           proxy=proxy,
-										   verify=verify,
-                                           pypi_server=pypi_server)
+        difference = [
+            x
+            for x in candidates
+            if x.lower() not in [z["name"].lower() for z in local]
+        ]
+        imports = local + get_imports_info(
+            difference, proxy=proxy, verify=verify, pypi_server=pypi_server
+        )
     # sort imports based on lowercase name of package, similar to `pip freeze`.
-    imports = sorted(imports, key=lambda x: x['name'].lower())
+    imports = sorted(imports, key=lambda x: x["name"].lower())
 
-    path = (args["--savepath"] if args["--savepath"] else
-            os.path.join(input_path, "requirements.txt"))
+    path = (
+        args["--savepath"]
+        if args["--savepath"]
+        else os.path.join(input_path, "requirements.txt")
+    )
 
     if args["--diff"]:
         diff(args["--diff"], imports)
@@ -460,12 +487,15 @@ def init(args):
         clean(args["--clean"], imports)
         return
 
-    if (not args["--print"]
-            and not args["--savepath"]
-            and not args["--force"]
-            and os.path.exists(path)):
-        logging.warning("requirements.txt already exists, "
-                        "use --force to overwrite it")
+    if (
+        not args["--print"]
+        and not args["--savepath"]
+        and not args["--force"]
+        and os.path.exists(path)
+    ):
+        logging.warning(
+            "requirements.txt already exists, " "use --force to overwrite it"
+        )
         return
 
     if args["--mode"]:
@@ -473,8 +503,10 @@ def init(args):
         if scheme in ["compat", "gt", "no-pin"]:
             imports, symbol = dynamic_versioning(scheme, imports)
         else:
-            raise ValueError("Invalid argument for mode flag, "
-                             "use 'compat', 'gt' or 'no-pin' instead")
+            raise ValueError(
+                "Invalid argument for mode flag, "
+                "use 'compat', 'gt' or 'no-pin' instead"
+            )
     else:
         symbol = "=="
 
@@ -488,8 +520,8 @@ def init(args):
 
 def main():  # pragma: no cover
     args = docopt(__doc__, version=__version__)
-    log_level = logging.DEBUG if args['--debug'] else logging.INFO
-    logging.basicConfig(level=log_level, format='%(levelname)s: %(message)s')
+    log_level = logging.DEBUG if args["--debug"] else logging.INFO
+    logging.basicConfig(level=log_level, format="%(levelname)s: %(message)s")
 
     try:
         init(args)
@@ -497,5 +529,5 @@ def main():  # pragma: no cover
         sys.exit(0)
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     main()  # pragma: no cover
diff --git a/tests/_data/test.py b/tests/_data/test.py
index fdb6ec3..73c15d2 100644
--- a/tests/_data/test.py
+++ b/tests/_data/test.py
@@ -1,56 +1,51 @@
 """unused import"""
 # pylint: disable=undefined-all-variable, import-error, no-absolute-import, too-few-public-methods, missing-docstring
+from __future__ import print_function
+
+import atexit
+import curses
+import importlib  # html/notebookapp.py
+import logging
+import os
+import os.path as test  # [unused-import]
+import signal
+import sqlite3
+import sys
+import time
 import xml.etree  # [unused-import]
 import xml.sax  # [unused-import]
-import os.path as test  # [unused-import]
-from sys import argv as test2  # [unused-import]
-from sys import flags  # [unused-import]
-# +1:[unused-import,unused-import]
-from collections import deque, OrderedDict, Counter
-# All imports above should be ignored
-import requests  # [unused-import]
-
+# astroid
 # setuptools
-import zipimport  # command/easy_install.py
-
+import zipimport  # manager.py
+# +1:[unused-import,unused-import]
+from collections import Counter, OrderedDict, deque
 # twisted
 from importlib import invalidate_caches  # python/test/test_deprecate.py
-
-# astroid
-import zipimport  # manager.py
 # IPython
 from importlib.machinery import all_suffixes  # core/completerlib.py
-import importlib  # html/notebookapp.py
-
-from IPython.utils.importstring import import_item  # Many files
-
-# pyflakes
-# test/test_doctests.py
-from pyflakes.test.test_imports import Test as TestImports
-
-# Nose
-from nose.importer import Importer, add_path, remove_path  # loader.py
+from sys import argv as test2  # [unused-import]
+from sys import flags  # [unused-import]
 
 # see issue #88
 import analytics
-import flask_seasurf
-
-import atexit
-from __future__ import print_function
-from docopt import docopt
-import curses, logging, sqlite3
-import logging
-import os
-import sqlite3
-import time
-import sys
-import signal
+import boto as b
 import bs4
-import nonexistendmodule
-import boto as b, peewee as p
 # import django
 import flask.ext.somext  # # #
+import flask_seasurf
+import nonexistendmodule
+import peewee as p
+# All imports above should be ignored
+import requests  # [unused-import]
+from docopt import docopt
+from IPython.utils.importstring import import_item  # Many files
+# Nose
+from nose.importer import Importer, add_path, remove_path  # loader.py
+# pyflakes
+# test/test_doctests.py
+from pyflakes.test.test_imports import Test as TestImports
 from sqlalchemy import model
+
 try:
     import ujson as json
 except ImportError:
@@ -62,4 +57,5 @@ import models
 def main():
     pass
 
+
 import after_method_is_valid_even_if_not_pep8
diff --git a/tests/_data_clean/test.py b/tests/_data_clean/test.py
index 8cffb51..13a6d6b 100644
--- a/tests/_data_clean/test.py
+++ b/tests/_data_clean/test.py
@@ -1,55 +1,50 @@
 """unused import"""
 # pylint: disable=undefined-all-variable, import-error, no-absolute-import, too-few-public-methods, missing-docstring
+from __future__ import print_function
+
+import atexit
+import curses
+import importlib  # html/notebookapp.py
+import logging
+import os
+import os.path as test  # [unused-import]
+import signal
+import sqlite3
+import sys
+import time
 import xml.etree  # [unused-import]
 import xml.sax  # [unused-import]
-import os.path as test  # [unused-import]
-from sys import argv as test2  # [unused-import]
-from sys import flags  # [unused-import]
-# +1:[unused-import,unused-import]
-from collections import deque, OrderedDict, Counter
-# All imports above should be ignored
-import requests  # [unused-import]
-
+# astroid
 # setuptools
-import zipimport  # command/easy_install.py
-
+import zipimport  # manager.py
+# +1:[unused-import,unused-import]
+from collections import Counter, OrderedDict, deque
 # twisted
 from importlib import invalidate_caches  # python/test/test_deprecate.py
-
-# astroid
-import zipimport  # manager.py
 # IPython
 from importlib.machinery import all_suffixes  # core/completerlib.py
-import importlib  # html/notebookapp.py
+from sys import argv as test2  # [unused-import]
+from sys import flags  # [unused-import]
 
+# see issue #88
+import analytics
+import boto as b
+import bs4
+# import django
+import flask.ext.somext  # # #
+import flask_seasurf
+import nonexistendmodule
+import peewee as p
+# All imports above should be ignored
+import requests  # [unused-import]
+from docopt import docopt
 from IPython.utils.importstring import import_item  # Many files
-
+# Nose
+from nose.importer import Importer, add_path, remove_path  # loader.py
 # pyflakes
 # test/test_doctests.py
 from pyflakes.test.test_imports import Test as TestImports
 
-# Nose
-from nose.importer import Importer, add_path, remove_path  # loader.py
-
-# see issue #88
-import analytics
-import flask_seasurf
-
-import atexit
-from __future__ import print_function
-from docopt import docopt
-import curses, logging, sqlite3
-import logging
-import os
-import sqlite3
-import time
-import sys
-import signal
-import bs4
-import nonexistendmodule
-import boto as b, peewee as p
-# import django
-import flask.ext.somext  # # #
 # from sqlalchemy import model
 try:
     import ujson as json
@@ -62,4 +57,5 @@ import models
 def main():
     pass
 
+
 import after_method_is_valid_even_if_not_pep8
diff --git a/tests/_data_ignore/.ignore_second/ignored.py b/tests/_data_ignore/.ignore_second/ignored.py
index b970ae3..6ea3598 100644
--- a/tests/_data_ignore/.ignore_second/ignored.py
+++ b/tests/_data_ignore/.ignore_second/ignored.py
@@ -1,2 +1,2 @@
 # Everything in here should be ignored
-from pattern.web import Twitter, plaintext
\ No newline at end of file
+from pattern.web import Twitter, plaintext
diff --git a/tests/_data_ignore/test.py b/tests/_data_ignore/test.py
index cfd039c..f520669 100644
--- a/tests/_data_ignore/test.py
+++ b/tests/_data_ignore/test.py
@@ -1,52 +1,48 @@
 """unused import"""
 # pylint: disable=undefined-all-variable, import-error, no-absolute-import, too-few-public-methods, missing-docstring
+from __future__ import print_function
+
+import atexit
+import curses
+import importlib  # html/notebookapp.py
+import logging
+import os
+import os.path as test  # [unused-import]
+import signal
+import sqlite3
+import sys
+import time
 import xml.etree  # [unused-import]
 import xml.sax  # [unused-import]
-import os.path as test  # [unused-import]
-from sys import argv as test2  # [unused-import]
-from sys import flags  # [unused-import]
-# +1:[unused-import,unused-import]
-from collections import deque, OrderedDict, Counter
-# All imports above should be ignored
-import requests  # [unused-import]
-
+# astroid
 # setuptools
-import zipimport  # command/easy_install.py
-
+import zipimport  # manager.py
+# +1:[unused-import,unused-import]
+from collections import Counter, OrderedDict, deque
 # twisted
 from importlib import invalidate_caches  # python/test/test_deprecate.py
-
-# astroid
-import zipimport  # manager.py
 # IPython
 from importlib.machinery import all_suffixes  # core/completerlib.py
-import importlib  # html/notebookapp.py
+from sys import argv as test2  # [unused-import]
+from sys import flags  # [unused-import]
 
+import boto as b
+import bs4
+# import django
+import flask.ext.somext  # # #
+import nonexistendmodule
+import peewee as p
+# All imports above should be ignored
+import requests  # [unused-import]
+from docopt import docopt
 from IPython.utils.importstring import import_item  # Many files
-
+# Nose
+from nose.importer import Importer, add_path, remove_path  # loader.py
 # pyflakes
 # test/test_doctests.py
 from pyflakes.test.test_imports import Test as TestImports
-
-# Nose
-from nose.importer import Importer, add_path, remove_path  # loader.py
-
-import atexit
-from __future__ import print_function
-from docopt import docopt
-import curses, logging, sqlite3
-import logging
-import os
-import sqlite3
-import time
-import sys
-import signal
-import bs4
-import nonexistendmodule
-import boto as b, peewee as p
-# import django
-import flask.ext.somext  # # #
 from sqlalchemy import model
+
 try:
     import ujson as json
 except ImportError:
@@ -58,4 +54,5 @@ import models
 def main():
     pass
 
+
 import after_method_is_valid_even_if_not_pep8
diff --git a/tests/test_pipreqs.py b/tests/test_pipreqs.py
index f82d3db..6e1510f 100644
--- a/tests/test_pipreqs.py
+++ b/tests/test_pipreqs.py
@@ -8,8 +8,9 @@ test_pipreqs
 Tests for `pipreqs` module.
 """
 
-import unittest
 import os
+import unittest
+
 import requests
 
 from pipreqs import pipreqs
@@ -145,7 +146,7 @@ class TestPipreqs(unittest.TestCase):
         Test that we can save requirements.txt correctly
         to a different path
         """
-        pipreqs.init({'<path>': self.project, '--savepath': self.alt_requirement_path, 
+        pipreqs.init({'<path>': self.project, '--savepath': self.alt_requirement_path,
                       '--use-local': None, '--proxy':None, '--pypi-server':None,  '--print': False,
                       '--diff': None, '--clean': None, '--mode': None})
         assert os.path.exists(self.alt_requirement_path) == 1
@@ -163,7 +164,7 @@ class TestPipreqs(unittest.TestCase):
         """
         with open(self.requirements_path, "w") as f:
             f.write("should_not_be_overwritten")
-        pipreqs.init({'<path>': self.project, '--savepath': None, '--use-local': None, 
+        pipreqs.init({'<path>': self.project, '--savepath': None, '--use-local': None,
                       '--force': None, '--proxy':None, '--pypi-server':None, '--print': False,
                       '--diff': None, '--clean': None, '--mode': None})
         assert os.path.exists(self.requirements_path) == 1
@@ -203,7 +204,7 @@ class TestPipreqs(unittest.TestCase):
         Test --ignore parameter
         """
         pipreqs.init(
-            {'<path>': self.project_with_ignore_directory, '--savepath': None, 
+            {'<path>': self.project_with_ignore_directory, '--savepath': None,
                       '--print': False, '--use-local': None, '--force': True,
                       '--proxy':None, '--pypi-server':None,
                       '--ignore':'.ignored_dir,.ignore_second',
@@ -222,7 +223,7 @@ class TestPipreqs(unittest.TestCase):
         Test --mode=no-pin
         """
         pipreqs.init(
-            {'<path>': self.project_with_ignore_directory, '--savepath': None, 
+            {'<path>': self.project_with_ignore_directory, '--savepath': None,
              '--print': False, '--use-local': None, '--force': True,
              '--proxy': None, '--pypi-server': None,
              '--diff': None,