New submission from Stefan Krah:
As I understand, _decimal_to_ratio() should always produce an
integer ratio. But it does not for positive exponents:
>>> import statistics
>>> statistics.mean([Decimal("100"), Decimal("200")])
Decimal('150')
>>> statistics.mean([Decimal("1e2"), Decimal("2e2")])
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python3.4/statistics.py", line 308, in mean
return _sum(data)/n
File "/usr/local/lib/python3.4/statistics.py", line 166, in _sum
total += Fraction(n, d)
File "/usr/local/lib/python3.4/fractions.py", line 163, in __new__
raise TypeError("both arguments should be "
TypeError: both arguments should be Rational instances
>>>
>>> statistics._decimal_to_ratio(Decimal("1e2"))
(1, 0.01)
>>> 1e2.as_integer_ratio()
(100, 1)
----------
components: Library (Lib)
messages: 210427
nosy: skrah, stevenjd
priority: high
severity: normal
stage: needs patch
status: open
title: statistics._decimal_to_ratio() produces non-integer ratio
type: behavior
versions: Python 3.4
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Python tracker <[email protected]>
<http://bugs.python.org/issue20536>
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