day6 random随机数模块

    random

我们经常看到网站的随机验证码,这些都是由随机数生成的,因此我们需要了解一下随机数的模块。如何生成随机数。

random 生成随机数

random.random()    生成0-1之间的小数

>>> import random
  >>> random.random()
  0.7386445925394346

random.randint(1,3)    生成1-3之间的整数随机数

>>> random.randint(1,5)
  4
  >>> random.randint(1,5)
  5

randrange(self,start,stop=None,step=1,_int=int)    def randrange(self, start, stop=None, step=1, _int=int):
    """Choose a random item from range(start, stop[, step]).

    This fixes the problem with randint() which includes the
    endpoint; in Python this is usually not what you want.

    """

    # This code is a bit messy to make it fast for the
    # common case while still doing adequate error checking.

randrange(self,start,stop,sep)生成随机数,可以定义步长。

>>> random.randrange(1,9,2)
  3
  >>> random.randrange(1,8,2)
  1
  >>> random.randrange(1,8,2)
  3
    生成5位随机数,例:

>>> random_num = random.randint(10000,99999)
  >>> random_num
  90821

方法二:

import random
  nums = []
  for i in range(5):
    if i == random.randint(1,5):
      nums.append(str(i))
    else:
      nums.append(chr(random.randint(65,90)))
  else:
    print("".join(nums))

运行结果如下:

CU23M

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