模块学习--random

>>> random.random()
0.82544262519395
>>> random.random()
0.11485429482423948
>>>

>>> random.randint(1,3)
3
>>> random.randint(1,3)
1
>>> random.randint(1,3)
2
>>>

这个也是
>>> random.randrange(1,4)
3
>>> random.randrange(1,4)
1
>>> random.randrange(1,4)
3
>>>

>>> random.choice(‘hello‘)
‘o‘
>>> random.sample(‘hello‘,2)
[‘h‘, ‘l‘]
>>> random.uniform(0,3)
2.306228935494692
>>> l = [1,2,3,4,5,6,7,8,9]
>>> random.shuffle(l)
>>> l
[9, 5, 2, 8, 7, 4, 6, 3, 1]
>>>

checkcode = ‘‘

for i in range(5):
    current = random.randrange(0,5)
    #字母
    if current == i:
        tmp=chr(random.randint(65,90))
    #数字
    else:
        tmp=random.randint(0,9)


    checkcode += str(tmp)

print(checkcode)