Exception raised when running on dal.py in web2py

[treyhunner]

Steps to reproduce

1. Download the dal.py file from web2py https://code.google.com/p/web2py/source/browse/gluon/dal.py
2. Run pep257 on this file
3. Witness the following exception:

Traceback (most recent call last):
  File "/usr/bin/pep257", line 8, in <module>
    sys.exit(main(*parse_options()))
  File "/usr/lib/python2.7/site-packages/pep257.py", line 411, in main
    for error in check(collected, ignore=options.ignore.split(',')):
  File "/usr/lib/python2.7/site-packages/pep257.py", line 394, in check
    for error in PEP257Checker().check_source(source, filename):
  File "/usr/lib/python2.7/site-packages/pep257.py", line 440, in check_source
    module = parse(StringIO(source), filename)
  File "/usr/lib/python2.7/site-packages/pep257.py", line 181, in __call__
    return self.parse_module()
  File "/usr/lib/python2.7/site-packages/pep257.py", line 252, in parse_module
    children = list(self.parse_definitions(Module, all=True))
  File "/usr/lib/python2.7/site-packages/pep257.py", line 212, in parse_definitions
    for definition in self.parse_definitions(class_):
  File "/usr/lib/python2.7/site-packages/pep257.py", line 209, in parse_definitions
    yield self.parse_definition(class_._nest(token.value))
  File "/usr/lib/python2.7/site-packages/pep257.py", line 268, in parse_definition
    children = list(self.parse_definitions(class_))
  File "/usr/lib/python2.7/site-packages/pep257.py", line 209, in parse_definitions
    yield self.parse_definition(class_._nest(token.value))
  File "/usr/lib/python2.7/site-packages/pep257.py", line 269, in parse_definition
    assert self.current.kind == tk.DEDENT
AttributeError: 'NoneType' object has no attribute 'kind'

[Nurdok]

I'm debugging this as we speak.
I found out the problem, still working on a solution.
The problem is after a definition, we expect an indent followed by some stuff and then a dedent.
Unfortunately this doesn't take one-liner definitions into account.
The following test case reproduces the error:

def foo(): return 4

[treyhunner]

This is not holding up my own use of pep257, it's simply a bug I had noticed when I accidentally ran it against dal.py from web2py. I appreciate the fast response though @Nurdok.

[Nurdok]

Thanks for taking the time to report this. I fixed this and opened a pull request.