Python随机数random模块使用指南

> import random
> random.random()
0.5038461831828231

> random.uniform(50,100)
76.81733455677832
> random.uniform(100,50)
52.98730193316595

> random.randint(50,100)
54
> random.randint(100,50)
 
Traceback (most recent call last):
 File "<pyshell#6>", line 1, in <module>
  random.randint(100,50)
 File "C:\Python27\lib\random.py", line 242, in randint
  return self.randrange(a, b+1)
 File "C:\Python27\lib\random.py", line 218, in randrange
  raise ValueError, "empty range for randrange() (%d,%d, %d)" % (istart, istop, width)
ValueError: empty range for randrange() (100,51, -49)
> random.randint(50.5,100.6)
 
Traceback (most recent call last):
 File "<pyshell#7>", line 1, in <module>
  random.randint(50.5,100.6)
 File "C:\Python27\lib\random.py", line 242, in randint
  return self.randrange(a, b+1)
 File "C:\Python27\lib\random.py", line 187, in randrange
  raise ValueError, "non-integer arg 1 for randrange()"
ValueError: non-integer arg 1 for randrange()

> random.randrange(100)
58
> random.randrange(10,100,2)
54

> random.choice(("stone","scissors","paper"))
'stone'
> random.choice(["stone","scissors","paper"])
'scissors'
> random.choice("Random")
'm'

> poker = ["A","2","3","4","5","6","7","8","9","10","J","Q","K"]
> random.shuffle(poker)
> poker
['4', '10', '8', '3', 'J', '6', '2', '7', '9', 'Q', '5', 'K', 'A']

> poker = ["A","2","3","4","5","6","7","8","9","10","J","Q","K"]
> random.sample(poker,5)
['4', '3', '10', '2', 'Q']