New submission from Vitaly Murashev:
Recently I found out that it not possible to debug python code if it is a part
of zip-module.
Python version being used is 3.3.0
Well known GUI debuggers like Eclipse+PyDev or PyCharm are unable to start
debugging and give the following warning:
---
pydev debugger: CRITICAL WARNING: This version of python seems to be
incorrectly compiled (internal generated filenames are not absolute)
pydev debugger: The debugger may still function, but it will work slower and
may miss breakpoints.
---
So I started my own investigation of this issue and results are the following.
At first I took traditional python debugger 'pdb' to analyze how it behaves
during debug of zipped module.
'pdb' showed me some backtaces and filename part for stack entries looks
malformed.
I expected something like
'full-path-to-zip-dir/my_zipped_module.zip/subdir/test_module.py'
but realy it looks like 'full-path-to-current-dir/subdir/test_module.py'
Source code in pdb.py and bdb.py (which one are a part of python stdlib) gave
me the answer why it happens.
The root cause are inside Bdb.format_stack_entry() + Bdb.canonic()
Please take a look at the following line inside 'format_stack_entry' method:
filename = self.canonic(frame.f_code.co_filename)
For zipped module variable 'frame.f_code.co_filename' holds _relative_ file
path started from the root of zip archive like 'subdir/test_module.py'
And as relult Bdb.canonic() method gives what we have -
'full-path-to-current-dir/subdir/test_module.py'
---
Looks like it is a bug in:
- in python core subsystem which one is responsible for loading zipped modules
- or in pdb debugger
----------
components: Interpreter Core, Library (Lib)
messages: 191907
nosy: vmurashev
priority: normal
severity: normal
status: open
title: Relative path in co_filename for zipped modules
type: behavior
versions: Python 3.3
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Python tracker <[email protected]>
<http://bugs.python.org/issue18307>
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