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I think float() should support non-ascii digits but I agree that it would be better to avoid UnicodeErrors and convert them to ValueErrors so that
>>> float('١٢٣٤.٥٦')
1234.56
and
>>> float('1⁄2')
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
ValueError: invalid literal for float(): 1⁄2
I.e. float should do the C equivalent of:
try:
 s = arg.encode('decimal')
except UnicodeEncodeError:
 raise ValueError('Invalid liter for float(): {}'.format(arg))
Note that int() and Decimal() supports non-ascii chars too.