IndexError when calling full_name of signature.

[jonathanslenders]

See: prompt-toolkit/python-prompt-toolkit#37

Getting the signature of the following input fails:

  ~  ptpython --vi
    In [1]: def bez(cps, t):
        2.     if len(cps) < 2:                        
        3.         return cps[0]                           
        4.     p1 = bez(cps[0:
                            ^--- Exception happened here

Traceback:

      File "/usr/local/lib/python2.7/dist-packages/prompt_toolkit/contrib/python_ins
        append((Signature, sig.full_name))
      File "/usr/local/lib/python2.7/dist-packages/jedi/api/classes.py", line 295, e
        path = [unicode(p) for p in self._path()]
      File "/usr/local/lib/python2.7/dist-packages/jedi/api/classes.py", line 170, h
        path.insert(0, par.name)
      File "/usr/local/lib/python2.7/dist-packages/jedi/api/interpreter.py", line 3_
        return getattr(self.parser_module, name)
      File "/usr/local/lib/python2.7/dist-packages/jedi/parser/fast.py", line 38, i_
        return getattr(self.parsers[0].module, name)
    IndexError: list index out of range

[jonathanslenders]

It looks like the following input raises the same error:

def a():
   a(b[0:

[thomasballinger]

Not sure if this is the same bug, but I get a similar trace from the following code: (see bpython/bpython#483)

>>> class Foo():
...     return

[davidhalter]

Did you both try with the latest dev branch? I have changed a few things in the interpreter completion system.

[thomasballinger]

That fixes my example!

[davidhalter]

Pretty sure it also fixes @jonathanslenders problem.

[davidhalter]

>>> jedi.Interpreter('def a():\n   a(b[0:', path='', namespaces=[locals()]).call_signatures()
[<CallSignature: a index None>]