[Python-bugs-list] [ python-Bugs-471928 ] global made w/nested list comprehensions
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Tue, 16 Oct 2001 23:06:44 -0700
Bugs item #471928, was opened at 2001-10-16 18:35
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Category: Python Interpreter Core
Group: Python 2.2
Status: Open
Resolution: None
Priority: 5
Submitted By: Neal Norwitz (nnorwitz)
>Assigned to: Thomas Wouters (twouters)
Summary: global made w/nested list comprehensions
Initial Comment:
This bug affects Python 2.1.1 & 2.2a4+.
In nested list comprehension code like this:
[bad for s in 'a b' for bad in s.split()]
the variable bad becomes a global, but it should be
local variable.
The attached file shows the disassembled byte code,
along with a test case.
The original source of the error was found from
cgi.py:209
in the standard library:
pairs = [s2 for s1 in qs.split('&') for s2 in
s1.split(';')]
Neal
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>Comment By: Guido van Rossum (gvanrossum)
Date: 2001-10-16 23:06
Message:
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user_id=6380
Good catch! I don't know the list comprehension code
generation, and I don't know who does. Maybe Thomas Wouters?
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You can respond by visiting:
http://sourceforge.net/tracker/?func=detail&atid=105470&aid=471928&group_id=5470