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 1.math简介

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>>>import math      #导入math模块
>>>dir(math)        #这句可查看所有函数名列表
>>>help(math)       #查看具体定义及函数原型

 

 

 2.常用函数

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acos(x)       # Return the arc cosine (measured in radians) of x.
 
asin(x)       # Return the arc sine (measured in radians) of x.
 
atan(x)       # Return the arc tangent (measured in radians) of x.
 
atan2(y, x)   # Return the arc tangent (measured in radians) of y/x.
              # Unlike atan(y/x), the signs of both x and y are considered.
 
ceil(x)       # Return the ceiling of x as a float.
              # This is the smallest integral value >= x.
 
cos(x)        # Return the cosine of x (measured in radians).
 
cosh(x)       # Return the hyperbolic(双曲线的) cosine of x.
 
degrees(x)    # converts angle x from radians(弧度) to degrees
 
exp(x)        # Return e raised to the power of x.
 
fabs(x)       # Return the absolute value of the float x.
 
floor(x)      # Return the floor of x as a float.
              # This is the largest integral value <= x.
 
fmod(x,y)     # Return fmod(x, y), according to platform C.  x % y may differ.
 
frexp(x)      # Return the mantissa and exponent of x, as pair (m, e).
              # m is a float and e is an int, such that x = m * 2.**e.
              # If x is 0, m and e are both 0.  Else 0.5 <= abs(m) < 1.0.
 
hypot(x,y)    # Return the Euclidean distance, sqrt(x*x + y*y).
 
ldexp(x, i)   # x * (2**i)
 
log(x[, base])   # the logarithm of x to the given base.
                 # If the base not specified, returns the natural logarithm (base e) of x.
 
log10(x)      # the base 10 logarithm of x.
 
modf(x)       # Return the fractional and integer parts of x.  Both results carry the sign
              # of x.  The integer part is returned as a real.
 
pow(x,y)      # Return x**y (x to the power of y).
 
radians(x)    # converts angle x from degrees to radians
 
sin(x)        # Return the sine of x (measured in radians).
 
sinh(x)       # Return the hyperbolic sine of x.
 
sqrt(x)       # Return the square root of x.
 
tan(x)        # Return the tangent of x (measured in radians).
 
tanh(x)       # Return the hyperbolic tangent of x.

 另外该模块定义了两个常量:

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= 2.7182818284590451
pi = 3.1415926535897931

 

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