randam模块 （随机选择）

import random
print (random.random())
print (random.randint(1,2))
print (random.randrange(1,10))

import random,string

str_1 = string.ascii_letters+string.digits
temp = ''.join(random.sample(str_1,6))

print (temp)



checkcode = ''
for i in range(6):
    current = random.randrange(0,6)
    if current != i:
        temp = chr(random.randint(65,90))
    else:
        temp = random.randint(0,9)
    checkcode += str(temp)
print (checkcode)