random 随机字符串大小写

src_digits = string.digits #string_数字 '0123456789'
src_uppercase = string.ascii_uppercase #string_大写字母 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
src_lowercase = string.ascii_lowercase #string_小写字母 'abcdefghijklmnopqrstuvwxyz'
src_special = string.punctuation #string_特殊字符 '!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~'

#sample从序列中选择n个随机独立的元素，返回列表
num = random.sample(src_digits,1) #随机取1位数字
lower = random.sample(src_uppercase,1) #随机取1位小写字母
upper = random.sample(src_lowercase,1) #随机取1位大写字母
special = random.sample(src_special,1) #随机取1位大写字母特殊字符
other = random.sample(string.ascii_letters+string.digits+string.punctuation,4) #随机取4位
# 生成字符串
# print(num, lower, upper, special, other)
pwd_list = num + lower + upper + special + other
# shuffle将一个序列中的元素随机打乱，打乱字符串
random.shuffle(pwd_list)
# 列表转字符串
password_str = ''.join(pwd_list)