【Python】验证码生成器

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import random

def random_num():
    code = ''
    for i in range(4):
        ran1 = random.randint(0,9)
        ran2 = chr(random.randint(65,90))
        add = random.choice([ran1,ran2])
        code = ''.join([code,str(add)])
    return code

rand_n = random_num()
print(rand_n)