Python Math Module

1.math Introduction

>>> Import Math

>>>dir (Math) #这句可查看所有函数名列表

[' __doc__ ', ' __name__ ', ' __package__ ', ' ACOs ', ' acosh ', ' asin ', ' Asinh ', ' atan ', ' atan2 ', ' Atanh ', ' ceil ', ' copysign ', ' Co  S ', ' cosh ', ' degrees ', ' e ', ' Erf ', ' erfc ', ' exp ', ' expm1 ', ' fabs ', ' factorial ', ' floor ', ' fmod ', ' frexp ', ' fsum ', ' Gamma ', ' Hypot ', ' isinf ', ' isNaN ', ' ldexp ', ' lgamma ', ' Log ', ' log10 ', ' log1p ', ' modf ', ' pi ', ' pow ', ' radians ', ' sin ', ' sinh ', ' sq ' RT ', ' tan ', ' tanh ', ' trunc '

>>>help (Math) #查看具体定义及函数0原型

>>>help (math.function) # View functions under the Math Module

2. Common functions

Ceil (x) Fetch top

Return the ceiling of x as a float.

This is the smallest integral value >= x.

Floor (x) Bottom

Return the floor of X as a float.

This is the largest integral value <= x.

Fabs (x) Take absolute value

Return the absolute value of the float x.

Factorial (x) factorial

Find x!. Raise a valueerror if x is negative or non-integral.

Hypot (x, y) Right triangle bevel length

Return the Euclidean distance, sqrt (x*x + y*y)

The Y-square of the POW (x, y) x

Return x**y (x to the power of Y).

sqrt (x) Open Square

Return the square root of X.

Log (X[,base])

Return the logarithm of x to the given base.

If the base is not specified, returns the natural logarithm (base e) of X.

LOG10 (x)

Return the base ten logarithm of X.

Trunc (x) truncation of rounding parts

Truncates x to the nearest Integral toward 0. Uses the __trunc__ Magic method.

isNaN (x) determines whether Nan (not a number)

Check if float x is not a number (NaN)

Degrees (x) radian Turn angle

Convert angle x from radians to degrees.

radians (x) angle to radians

Convert angle x from degrees to radians.

In addition, the module defines two constants:

E = 2.718281828459045

PI = 3.141592653589793

Python Math Module