[issue27412] float('∞') returns 8.0

[Eryk Sun]

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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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27412>
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