# math --- Mathematical functions — Constants

> The mathematical constant π = 3.141592..., to available precision.

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The mathematical constant π = 3.141592..., to available precision.

The mathematical constant e = 2.718281..., to available precision.

The mathematical constant τ = 6.283185..., to available precision. Tau is a circle constant equal to 2\ π, the ratio of a circle's circumference to its radius. To learn more about Tau, check out Vi Hart's video Pi is (still) Wrong &lt; and start celebrating Tau day &lt; by eating twice as much pie!

A floating-point positive infinity. (For negative infinity, use -math.inf.) Equivalent to the output of float('inf').

A floating-point "not a number" (NaN) value. Equivalent to the output of float('nan'). Due to the requirements of the IEEE-754 standard &lt; math.nan and float('nan') are not considered to equal to any other numeric value, including themselves. To check whether a number is a NaN, use the isnan function to test for NaNs instead of is or ==. Example

The !math module consists mostly of thin wrappers around the platform C math library functions. Behavior in exceptional cases follows Annex F of the C99 standard where appropriate. The current implementation will raise ValueError for invalid operations like sqrt(-1.0) or log(0.0) (where C99 Annex F recommends signaling invalid operation or divide-by-zero), and OverflowError for results that overflow (for example, exp(1000.0)). A NaN will not be returned from any of the functions above unless one or more of the input arguments was a NaN; in that case, most functions will return a NaN, but (again following C99 Annex F) there are some exceptions to this rule, for example pow(float('nan'), 0.0) or hypot(float('nan'), float('inf')).

Note that Python makes no effort to distinguish signaling NaNs from quiet NaNs, and behavior for signaling NaNs remains unspecified. Typical behavior is to treat all NaNs as though they were quiet.

Module cmath Complex number versions of many of these functions.

Module math.integer Integer-specific mathematics functions.

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