As requested on the bug tracker, I've submitted a pull request for is_integer() support on the other numeric types. https://github.com/python/cpython/pull/6121
These are the tactics I used to implement it: - float: is_integer() already exists, so no changes - int: return True - Real: return x == int(x). Although Real doesn't explicitly support conversation to int with __int__, it does support conversion to int with __trunc__. The int constructor falls back to using __trunc__. - Rational (also inherited by Fraction): return x.denominator == 1 as Rational requires that all numbers must be represented in lowest form. - Integral: return True - Decimal: expose the existing dec_mpd_isinteger C function to Python as is_integer()
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