failing traceback in terminal ipython for first exception

[jstenar]

The minimum example that reliably recreates this problem on windows python 2.7 (master ffc36cc):

Create an empty profile and add the following code to a py file in the startup folder for the new profile:

import inspect
inspect.stack()

Now start ipython and generate an exception:

IPython 0.14.dev -- An enhanced Interactive Python.
?         -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help      -> Python's own help system.
object?   -> Details about 'object', use 'object??' for extra details.

IPython profile: empty

In [1]: 1/0
ERROR: Internal Python error in the inspect module.
Below is the traceback from this internal error.
Traceback (most recent call last):
  File "C:\python27\lib\site-packages\ipython-0.14.dev-py2.7.egg\IPython\core\ultratb.py", line 749, in structured_traceback
    records = _fixed_getinnerframes(etb, context, tb_offset)
  File "C:\python27\lib\site-packages\ipython-0.14.dev-py2.7.egg\IPython\core\ultratb.py", line 235, in _fixed_getinnerframes
    records  = fix_frame_records_filenames(inspect.getinnerframes(etb, context))
  File "C:\python27\lib\inspect.py", line 1041, in getinnerframes
    framelist.append((tb.tb_frame,) + getframeinfo(tb, context))
  File "C:\python27\lib\inspect.py", line 1001, in getframeinfo
    filename = getsourcefile(frame) or getfile(frame)
  File "C:\python27\lib\inspect.py", line 456, in getsourcefile
    if hasattr(getmodule(object, filename), '__loader__'):
  File "C:\python27\lib\inspect.py", line 499, in getmodule
    f = getabsfile(module)
  File "C:\python27\lib\inspect.py", line 468, in getabsfile
    _filename = getsourcefile(object) or getfile(object)
  File "C:\python27\lib\inspect.py", line 447, in getsourcefile
    if string.lower(filename[-4:]) in ('.pyc', '.pyo'):
TypeError: 'NoneType' object is not subscriptable

Unfortunately, your original traceback can not be constructed.

The second time we try to generate the traceback:

In [2]: 1/0
---------------------------------------------------------------------------
ZeroDivisionError                         Traceback (most recent call last)
<ipython-input-2-05c9758a9c21> in <module>()
----> 1 1/0

ZeroDivisionError: integer division or modulo by zero

As far as I have been able to determine the traceback is caused by __main__.__file__ being None at startup in the terminal console but not in any of the other terminals. %run:ing some code also sets __main__.__file__ to a reasonable value.

In [1]: %run pass.py

In [2]: 1/0
---------------------------------------------------------------------------
ZeroDivisionError                         Traceback (most recent call last)
<ipython-input-2-05c9758a9c21> in <module>()
----> 1 1/0

ZeroDivisionError: integer division or modulo by zero

Setting a break point in inspect.getsourcefile:

In [1]: 1/0
> c:\python27\lib\inspect.py(449)getsourcefile()
-> if string.lower(filename[-4:]) in ('.pyc', '.pyo'):
(Pdb) list 446
441
442     def getsourcefile(object):
443         """Return the filename that can be used to locate an object's source.
444         Return None if no way can be identified to get the source.
445         """
446         filename = getfile(object)
447         if filename is None:
448             import pdb;pdb.set_trace()
449  ->     if string.lower(filename[-4:]) in ('.pyc', '.pyo'):
450             filename = filename[:-4] + '.py'
451         for suffix, mode, kind in imp.get_suffixes():
(Pdb) object.__file__
(Pdb) object
<module '__main__' (built-in)>

[jstenar]

whoops I managed to create this one twice (closing now)