#23 Fix errors and flake8

django_migration_linter/constants.py

@@ -18,4 +18,6 @@ from appdirs import user_cache_dir
 
 __VERSION__ = '0.0.7'
 
-DEFAULT_CACHE_PATH = Path(user_cache_dir("django-migration-linter", version=__VERSION__))
+DEFAULT_CACHE_PATH = Path(
+    user_cache_dir("django-migration-linter", version=__VERSION__)
+)

django_migration_linter/utils.py

@@ -59,4 +59,4 @@ def clean_bytes_to_str(byte_input):
 
 
 def get_default_cache_file(project_name):
-    os.join(DEFAULT_CACHE_PATH, '{0}.pickle'.format(project_name))
+    return os.path.join(DEFAULT_CACHE_PATH, '{0}.pickle'.format(project_name))

setup.py

@@ -11,15 +11,23 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-
+import ast
+import re
 from os import path
 from setuptools import setup, find_packages
 
 
 PROJECT_DIR = path.abspath(path.dirname(__file__))
 
-# Read __VERSION__
-exec(open('./django_migration_linter/constants.py').read())
+
+def get_version():
+    constants = path.join(PROJECT_DIR, 'django_migration_linter', 'constants.py')
+    _version_re = re.compile(r"__VERSION__\s+=\s+(?P<version>.*)")
+    with open(constants, "r") as f:
+        match = _version_re.search(f.read())
+        version = match.group("version") if match is not None else '"unknown"'
+    return str(ast.literal_eval(version))
+
 
 
 with open(path.join(PROJECT_DIR, 'README.rst')) as f:
@@ -39,7 +47,7 @@ test_requirements = [
 # noinspection PyUnresolvedReferences
 setup(
     name='django-migration-linter',
-    version=__VERSION__,
+    version=get_version(),
 
     description='Detect backward incompatible migrations for your django project',
     long_description=long_description,