Eryk Sun added the comment:
There's something wrong with however you're testing this.
>>> s = '\N{infinity}'
>>> s == '∞' == '\u221e'
True
'∞' isn't numeric. It's a math symbol (Sm):
>>> unicodedata.category(s)
'Sm'
>>> s.isdecimal()
False
>>> s.isdigit()
False
So float('∞') should raise a ValueError:
>>> float(s)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: could not convert string to float: '∞'
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nosy: +eryksun
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<http://bugs.python.org/issue27412>
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