python之随机模块

python之随机模块

random模块——随机数模块

 

import random
print(random.random())          #(0,1),大于0小于1之间小数
print(random.randint(1,3))        #[1,3],大于等于1且小于等于3之间的整数
print(random.randrange(1,3))    #[1,3),d大于等于1且小于3之间的整数
print(random.choice([1,'23',[4,5]]))    #1或23或[4,5]
print(random.sample([1,'23',[4,5]],2))    #列表元素任意2个组合
print (random.uniform(1,3))                #大于1小于3的小数，如1.99
random.shuffle(item)                   #打乱item的顺序



>>> import random
>>> print(random.random())
0.6351521979178012
>>> print(random.randint(1,3))
3
>>> print(random.choice([1,'23',[4,5]]))
23
>>> print(random.sample([1,'23',[4,5]],2))
[[4, 5], '23']
>>> print (random.uniform(1,3))
2.9326720236539474

打乱顺序（洗牌功能）

item=[1,3,5,7,9]
random.shuffle(item)
print(item)

>>> item=[1,3,5,7,9]
>>> random.shuffle(item)
>>> print(item)
[1, 5, 9, 3, 7]

随机验证码功能

>>> import random
>>> res=''
>>> for i in range(6):
...     s1=chr(random.randint(65,90))
...     s2=str(random.randint(0,9))
...     res+=random.choice([s1,s2])
...
>>> print(res)
U6JRFU

----------------再次优化
>>> import random
>>> def make_code(size=4):
...     res=''
...     for i in range(size):
...         s1=chr(random.randint(65,90))
...         s2=str(random.randint(0,9))
...         res+=random.choice([s1,s2])
...     return res
...
>>> print(make_code())
9869
>>> print(make_code(6))
EW1N78