pydiatra is yet another static checker for Python code.

The following checks are implemented:

• embedded code copies
• except shadowing builtins (e.g. except IOError, OSError:, which overwrites OSError)
• bare except (i.e. except:)
• hardcoded errno values (e.g. exc.errno == 2 instead of exc.errno == errno.ENOENT)
• inconsistent use of tabs and spaces in indentation
• mkstemp() file descriptor leaks (e.g. path = tempfile.mkstemp()[1])
• obsolete PIL imports (e.g. import Image instead of from PIL import Image)
• regular expression syntax errors
• misplaced flags arguments in re.split(), re.sub(), re.subn()
• dubious or deprecated constructs in regular expressions:
  • duplicate range (e.g. re.compile("[aa]"))
  • overlapping ranges (e.g. re.compile("[a-zA-z]"))
  • bad escape sequences (e.g. re.compile(r"\eggs"))
  • misplaced inline flags (e.g. re.compile("eggs(?i)"); Python 3.6+ only)
  • combining incompatible flags
  • redundant flags
• string exceptions (e.g. raise "eggs" or except "ham":)
• string formatting errors
• comparisons with sys.version or sys.hexversion
• Python syntax errors
• Python syntax warnings
  • assertions that are always true
  • syntactic constructs that are no longer supported in Python 3
  • ill-formed assignments to global variables
  • use of async and await as names
  • invalid escape sequences in strings (Python 3.6+ only)