Updated standard Python setup

setup.py

@@ -15,29 +15,32 @@ PACKAGE_NAME = 'datagraph'
 with open('README.md') as f:
     readme = f.read()
 
-with open(PACKAGE_NAME + '/_version.py') as f:
-    text = f.read()
+def parse_version_file(text: str) -> str:
     match = re.match(r'^__version__\s*=\s*(["\'])([\d\.]+)\1$', text)
-    version = match.group(2)
-    del match, text
+    if match is None:
+        msg = 'Malformed _version.py file!'
+        raise Exception(msg)
+    return match.group(2)
 
+with open(PACKAGE_NAME + '/_version.py') as f:
+    version = parse_version_file(f.read())
 
 def parse_requirements(text: str) -> list[str]:
     return text.strip().split('\n')
 
 
-def read_requirements(path: str):
+def read_requirements(path: str) -> list[str]:
     with open(path) as f:
         return parse_requirements(f.read())
 
 
-def get_short_description(readme: str):
+def determine_short_description(readme: str) -> str:
     readme = re.sub(r'#+[^\n]*\n+', '', readme)
-    m = re.search(r'^\s*(\w+[\w\s,`-]+\.)', readme)
+    m = re.search(r'^\s*(\w+[\w\s,`+-]+\.)', readme)
     try:
         return m.group(1)
     except AttributeError as err:
-        msg = 'Could not determine short description'
+        msg = f'Could not determine short description: {readme}'
         raise Exception(msg) from err
 
 
@@ -55,7 +58,7 @@ pytest
 setup(
     name=PACKAGE_NAME,
     version=version,
-    description=get_short_description(readme),
+    description=determine_short_description(readme),
     long_description=readme,
     long_description_content_type='text/markdown',
     author='Jmaa',