Message175536
When attempting to convert a float("nan"), float("inf"), or float("-inf"), fractions.Fraction() raises different exceptions than int()
>>> int(float("nan"))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: cannot convert float NaN to integer
>>> fractions.Fraction(float("nan"))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/opt/local/lib/python3.2/fractions.py", line 114, in __new__
value = Fraction.from_float(numerator)
File "/opt/local/lib/python3.2/fractions.py", line 186, in from_float
raise TypeError("Cannot convert %r to %s." % (f, cls.__name__))
TypeError: Cannot convert nan to Fraction.
>>> int(float("inf"))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
OverflowError: cannot convert float infinity to integer
>>> fractions.Fraction(float("inf"))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/opt/local/lib/python3.2/fractions.py", line 114, in __new__
value = Fraction.from_float(numerator)
File "/opt/local/lib/python3.2/fractions.py", line 186, in from_float
raise TypeError("Cannot convert %r to %s." % (f, cls.__name__))
TypeError: Cannot convert inf to Fraction.
>>> int(float("-inf"))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
OverflowError: cannot convert float infinity to integer
>>> fractions.Fraction(float("-inf"))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/opt/local/lib/python3.2/fractions.py", line 114, in __new__
value = Fraction.from_float(numerator)
File "/opt/local/lib/python3.2/fractions.py", line 186, in from_float
raise TypeError("Cannot convert %r to %s." % (f, cls.__name__))
TypeError: Cannot convert -inf to Fraction.
Should the exceptions be changed to ValueError and OverflowError? |
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Date |
User |
Action |
Args |
2012-11-14 06:30:20 | casevh | set | recipients:
+ casevh |
2012-11-14 06:30:20 | casevh | set | messageid: <1352874620.08.0.771603502235.issue16469@psf.upfronthosting.co.za> |
2012-11-14 06:30:20 | casevh | link | issue16469 messages |
2012-11-14 06:30:19 | casevh | create | |
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