all Python 3cmathfunction

cmath.isinf()

checking

Checks whether at least one part of a complex number, real or imaginary, is infinite.

Syntax

cmath.isinf(z)

One infinite part is enough, even if the other is NaN: isinf(complex(nan, inf)) is True, and isnan of the same number is True as well. So isinf and isnan are not mutually exclusive, and the order of if/elif when handling special values changes the result.

Examples

import cmath
z = complex(float('nan'), float('inf'))
print(cmath.isinf(z), cmath.isnan(z))  # → True True
print(cmath.isinf(cmath.infj))  # → True

See also

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