IndexError while making recursive function

[pgy]

IndexError was thrown while typing the following:

➜  ~  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

Full output:

➜  ~  ptpython --vi
In [1]: def bez(cps, t):
     2.     if len(cps) < 2:                        
     3.         return cps[0]                           
     4.     p1 = bez(Traceback (most recent call last):
  File "/usr/local/bin/ptpython", line 80, in <module>
    _run_repl()       all                        
  File "/usr/local/bin/ptpython", line 77, in _run_repl
    startup_paths=startup_paths, always_multiline=always_multiline)
  File "/usr/local/lib/python2.7/dist-packages/prompt_toolkit/contrib/repl.py",d
    cli.start_repl(startup_paths=startup_paths)
  File "/usr/local/lib/python2.7/dist-packages/prompt_toolkit/contrib/repl.py",l
    on_exit=AbortAction.RAISE_EXCEPTION)
  File "/usr/local/lib/python2.7/dist-packages/prompt_toolkit/__init__.py", lint
    self._redraw()
  File "/usr/local/lib/python2.7/dist-packages/prompt_toolkit/__init__.py", linw
    self.renderer.render(self)
  File "/usr/local/lib/python2.7/dist-packages/prompt_toolkit/renderer.py", linr
    output = self.render_to_str(cli)
  File "/usr/local/lib/python2.7/dist-packages/prompt_toolkit/renderer.py", linr
    self.layout.write_to_screen(cli, screen, height)
  File "/usr/local/lib/python2.7/dist-packages/prompt_toolkit/layout/__init__.pn
    t.write(cli, screen)z(cps, t)                                               
  File "/usr/local/lib/python2.7/dist-packages/prompt_toolkit/layout/toolbars.pe
    tokens = self.get_tokens(cli, width)
  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

[pgy]

➜  ~  uname -a && python --version && pip freeze | grep -P 'jedi|prompt|wcwidth|docop'
Linux ygp-vbox 3.13.0-32-generic #57-Ubuntu SMP Tue Jul 15 03:51:08 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
Python 2.7.6
docopt==0.6.2
jedi==0.8.1-final0
prompt-toolkit==0.19
wcwidth==0.1.1

[jonathanslenders]

Thank you @pgy for reporting. I could reproduce it. It happens already at the following recursive input:

def a():
   a(b[0:

Unfortunately this is a bug in Jedi, i created a workaround until it's fixed there: 36efe35

[jonathanslenders]

Hi all, closing this ticket because ptpython was removed from prompt-toolkit and got its own repository: https://github.com/jonathanslenders/ptpython/ . Further, the Jedi library for ptpython has been upgraded and we handle all known exceptions already. Let's create a new ticket if it happens again.