Why are closures broken within exec?
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by Devin Jeanpierre
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Published on 2010-05-01T10:59:11Z
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2010/05/01
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In Python 2.6,
>>> exec "print (lambda: a)()" in dict(a=2), {}
2
>>> exec "print (lambda: a)()" in globals(), {'a': 2}
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<string>", line 1, in <module>
File "<string>", line 1, in <lambda>
NameError: global name 'a' is not defined
>>> exec "print (lambda: a).__closure__" in globals(), {'a': 2}
None
I expected it to print 2 twice, and then print a tuple with a single cell. It is the same situation in 3.1. What's going on?
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