cleanup: pep8

also remove empty class parenthesis

doc/python_api/examples/bpy.types.Panel.2.py

@@ -7,7 +7,7 @@ A mix-in parent class can be used to share common properties and
 import bpy
 
 
-class View3DPanel():
+class View3DPanel:
     bl_space_type = 'VIEW_3D'
     bl_region_type = 'TOOLS'
 

doc/python_api/sphinx_changelog_gen.py

@@ -316,7 +316,7 @@ def main():
 
     try:
         import argparse
-    except:
+    except ImportError:
         print("Old Blender, just dumping")
         api_dump()
         return