lot of pep 8 and others

.github/ISSUE_TEMPLATE/feature_request.md

@@ -10,13 +10,15 @@ assignees: ""
 Welcome! Before you write your Feature Request, please read below:
 
 **Is your feature request related to a problem? Please describe.**
-A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+A clear and concise description of what the problem is. Ex. I'm always 
+frustrated when [...]
 
 **Describe the solution you'd like**
 A clear and concise description of what you want to happen.
 
 **Describe alternatives you've considered**
-A clear and concise description of any alternative solutions or features you've considered.
+A clear and concise description of any alternative solutions or 
+features you've considered.
 
 **Additional context**
 Add any other context or screenshots about the feature request here.

setup.py

@@ -16,10 +16,15 @@
 bug_url = "https://github.com/Marco-Sulla/python-frozendict/issues"
 author = "Marco Sulla"
 author_email = "[email protected]"
-license  = "LGPL v3"
+license = "LGPL v3"
 license_files = "LICENSE.txt"
 description = "A simple immutable dictionary"
-keywords = "immutable hashable picklable frozendict dict dictionary map Mapping MappingProxyType developers stable utility"
+
+keywords = (
+    "immutable hashable picklable frozendict dict dictionary " +
+    "map Mapping MappingProxyType developers stable utility"
+)
+
 python_requires = ">=3.6"
 
 classifiers = [
@@ -61,7 +66,10 @@
 package_path_str = str(package_path)
 packages = setuptools.find_packages(where = package_path_str)
 package_data_filenames = (py_typed_filename, mypy_filename)
-package_data = {package_name: package_data_filenames for package_name in packages}
+package_data = {
+    package_name: package_data_filenames
+    for package_name in packages
+}
 
 # C extension - START
 
@@ -118,6 +126,7 @@
 if argv_1_exists and argv[1] == "c_debug":
     undef_macros = ["NDEBUG"]
 
+
 def get_ext_module(
     fullname, 
     sources, 
@@ -137,6 +146,7 @@ def get_ext_module(
 
     return ext_module
 
+
 def get_ext_module_1(optional):
     return get_ext_module(
         fullname = ext1_fullname,
@@ -149,13 +159,14 @@ def get_ext_module_1(optional):
 
 # C extension - END
 
+
 common_setup_args = dict(
     name = name,
     author = author,
     author_email = author_email,
     version = version,
     python_requires = python_requires,
-    license  = license,
+    license = license,
     license_files = (license_files, ),
     url = main_url,
 
@@ -197,10 +208,11 @@ def get_ext_module_1(optional):
 pure_py = pure_py_env == '1'
 
 mix_c_py_error = ValueError(
-    "You can't specify the pure py implementation *and* C extension togheter"
+    "You can't specify the pure py implementation *and* C " +
+    "extension togheter"
 )
 
-if custom_arg == None:
+if custom_arg is None:
     if impl == "PyPy" or not c_src_path.exists():
         custom_arg = "py"
     else:

src/frozendict/__init__.py

@@ -16,24 +16,20 @@
 
 
 def _getFrozendictJsonEncoder(BaseJsonEncoder = None):
-    if BaseJsonEncoder == None:
+    if BaseJsonEncoder is None:
         from json.encoder import JSONEncoder
 
-
         BaseJsonEncoder = JSONEncoder
 
-
-    class FrozendictJsonEncoder(BaseJsonEncoder):
+    class FrozendictJsonEncoderInternal(BaseJsonEncoder):
         def default(self, obj):
             if isinstance(obj, frozendict):
                 # TODO create a C serializer
                 return dict(obj)
 
-
             return BaseJsonEncoder.default(self, obj)
 
-
-    return FrozendictJsonEncoder
+    return FrozendictJsonEncoderInternal
 
 
 FrozendictJsonEncoder = _getFrozendictJsonEncoder()

src/frozendict/__init__.pyi

@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TypeVar, overload, Optional
+from typing import TypeVar, overload, Optional, Union
 
 try:
     from typing import Mapping, Iterable, Iterator, Tuple, Type