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Jul 3, 2012, 1:11 PM
Post #1 of 1
New submission from João Bernardo <jbvsmo [at] gmail>:
[issue15245] ast.literal_eval on some literals
`ast.literal_eval` is very strict on names, so it seems to lack some "literals" that may be result of `repr` on built-in objects.
-> Obvious cases:
both result on ValueError.
-> Not so obvious:
nan_name = repr(float('nan'))
ast.literal_eval(nan_name) # ValueError
inf_name = repr(float('inf'))
ast.literal_eval(inf_name) # ValueError
ast.literal_eval("2e308") # == inf
`nan` and `inf` are not literals (at least "inf" should be, but that's another problem), but their representations are not possible to be evaluated unlike any other float numbers with maybe precision loss.
I think `literal_eval` should include these 3 names the same way it accepts True, False and None.
Another case, that I personally don't care, but seems plausible would be `NotImplemented`.
components: Library (Lib)
title: ast.literal_eval on some literals
versions: Python 3.3
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