python 产生随机数 随机字符串

import random




def foura_4():




    dd0 = (random.sample('yxwvutsrqponmlkjihgfedcba',1))
    ss0 = dd0[0]
    dd1 = (random.sample('yxwvutsrqponmlkjihgfedcba', 1))
    ss1 = dd1[0]
    dd2 = (random.sample('yxwvutsrqponmlkjihgfedcba', 1))
    ss2 = dd2[0]
    dd3 = (random.sample('yxwvutsrqponmlkjihgfedcba', 1))
    ss3 = dd3[0]


    print (ss0+ss1+ss2+ss3)




#重复执行函数~
for i in range(100):
    foura_4()