[issue25974] Fix statistics.py after the Decimal.as_integer_ratio() change

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

LGTM.

I haven't tested that "type(x) is float or type(x) is Decimal" is faster than alternatives ("type(x) in (float, Decimal)", or "isinstance(x, (float, Decimal))", or "hasattr(x, 'as_integer_ratio')") and believe you have tested this.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25974>
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