python数学模块.docx

9.2. math — Mathematical functions¶

This module is always available. It provides access to the mathematical functions

defined by the C standard.

These functions cannot be used with complex numbers; use the functions of the

same name from the cmath module if you require support for complex numbers. The

The following functions are provided by this module. Except when explicitly noted

otherwise, all return values are floats.

9.2.1. Number-theoretic and representation functions

float

but

arguments.

the result

The algorithm’s accuracy depends on IEEE-754 arithmetic guarantees and the typical

case where the rounding mode is half-even. On some non-Windows builds, the

underlying C library uses extended precision addition and may occasionally

double-round an intermediate sum causing it to be off in its least significant bit.

Return the greatest common divisor of the integers a and b. If either a or b is nonzero,

both a and b.gcd(0, 0) returns 0.