[issue5197] vars() assignment fails silently when assignments made later

[pest]

New submission from pest <luke at asterisk.co.nz>:

Assignments to vars() behave incorrectly if those variables are use
later on in a function.

For example, try this:

======
#!/usr/bin/python

def zz():
        for i in [1,2,3]:
                for j in [4,5,6]:
                        vars()['fw_%s_%s' % (j,i)] = 'test %s %s' % (j, i)
                        print vars()['fw_%s_%s' % (j,i)]

        fw_4_2 = 'zz'
        print fw_4_2

zz()
======

The assignments work fine up till 4_2. At 4_2, the assignment apparently
fails silently, and the print raises a keyError exception.

----------
components: None
messages: 81530
nosy: pest
severity: normal
status: open
title: vars() assignment fails silently when assignments made later
type: behavior
versions: Python 2.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5197>
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