[issue17526] inspect.findsource raises undocumented error for code objects with empty filename

[Nils Bruin]

New submission from Nils Bruin:

It would seem reasonable that an empty filename would be a legitimate way of indicating that a code object does not have a corresponding source file. However, if one does that then inspect.findsource raises an unexpected IndexError rather than the documented IOError.

This seems due to the fix introduced on issue9284

Python 3.2.3 (default, Jun  8 2012, 05:40:07) 
[GCC 4.6.3 20120306 (Red Hat 4.6.3-2)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import inspect
>>> C=compile("print(1)","<string>","single")
>>> D=compile("print(1)","","single")
>>> inspect.findsource(C)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib64/python3.2/inspect.py", line 547, in findsource
    raise IOError('could not get source code')
IOError: could not get source code
>>> inspect.findsource(D)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib64/python3.2/inspect.py", line 537, in findsource
    if not sourcefile and file[0] + file[-1] != '<>':
IndexError: string index out of range

----------
components: Library (Lib)
messages: 185025
nosy: Nils.Bruin
priority: normal
severity: normal
status: open
title: inspect.findsource raises undocumented error for code objects with empty filename
type: behavior
versions: Python 2.7, Python 3.2

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17526>
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