[ python-Bugs-966992 ] cgitb.scanvars fails

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Bugs item #966992, was opened at 2004-06-05 08:59
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Category: Python Library
Group: Python 2.4
Status: Open
Resolution: None
Priority: 5
Submitted By: Robin Becker (rgbecker)
Assigned to: Nobody/Anonymous (nobody)
Summary: cgitb.scanvars fails

Initial Comment:
Under certain circumstances cgitb.scanvars fails with
because of an unititialized value variable. This bug is
present in 2.3.3 and 2.4a0.

The following script demonstrates
#####start
import cgitb;cgitb.enable()

def err(L):
    if 'never' in L:
        return
    if 1: print     '\n'.join(L)
    v=2

err(['',None])
#####finish

when run this results in mangled output because scanvars
attempts to evaluate '\n'.join(L) where L=['',None]. A
fix is to set value=__UNDEF__ at the start of scanvars.

Index: cgitb.py
===================================================================
RCS file: /cvsroot/python/python/dist/src/Lib/cgitb.py,v
retrieving revision 1.11
diff -r1.11 cgitb.py
63c63
<     vars, lasttoken, parent, prefix = [], None, None, ''
---
>     vars, lasttoken, parent, prefix, value = [],
None, None, '', __UNDEF__


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