New submission from Peter Eastman:
The following script demonstrates a bug in the exec() function in Python 3.4.
(It works correctly in 2.7).
script = """
print(a)
print([a for i in range(5)])
"""
exec(script, globals(), {"a":5})
It produces the following output:
5
Traceback (most recent call last):
File "test.py", line 5, in <module>
exec(script, globals(), {"a":5})
File "<string>", line 3, in <module>
File "<string>", line 3, in <listcomp>
NameError: name 'a' is not defined
The variable "a" is getting passed to the script, as expected: printing it out
works correctly. But if you use it in a comprehension, the interpreter claims
it does not exist.
----------
messages: 248064
nosy: Peter Eastman
priority: normal
severity: normal
status: open
title: Incorrect handling of local variables in comprehensions with exec()
type: behavior
versions: Python 3.4
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Python tracker <[email protected]>
<http://bugs.python.org/issue24800>
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