import random
# 用range()
def code(len):
code_list = []
for i in range(10):
code_list.append(str(i)) #生成数字
for i in range(65, 91):
code_list.append(chr(i)) #生成大写字母
for i in range(97, 123):
code_list.append(chr(i)) #生成小写字母
r = random.sample(code_list, len)
m = ''.join(r)
return m
if __name__ == '__main__':
n = code(6)
print(n)
