用户登录验证

# 完成用户登录验证
# 要求:
#   1. 系统自动生成4位随机数. 作为登录验证码. 直接用就好. 这里不用纠结
    #   from random import randint
    #   num = 0
    #   verify_code = ""
    #   while num < 4:
    #   verify_code += chr(randint(65, 90))
    #   num += 1
    #   print(verify_code) # 四位随机验证码
#   2. 用户输入用户名和密码还有验证码.
#   3. 用户可以有三次登录的机会. 但是验证码如果输入错误. 不计算在内

#
# from random import randint
#
# count = 1
# while count <= 3:
#     num = 0
#     verify_code = ""
#     while num < 4:
#         verify_code += chr(randint(65, 90))
#         num += 1
#     # print(verify_code)
#
#     # 用户登录
#     username = "alex"
#     password = "123"
#
#     # 用户输入
#     uname = input("请输入你的用户名:" )
#     upwd = input("请输入你的密码:")
#     vi_code = input(f"请输入你的验证码{verify_code}:")
#
#     # 判断验证码
#     if vi_code.upper() == verify_code.upper():
#         print("验证码正确")
#         # 判断用户名和密码
#         if uname == username and upwd == password:
#             print("登录成功")
#             break
#         else:
#             print("登录失败(还剩下%s次机会)" % (3-count))
#             count += 1  # ????  000 000  - 999 999
#     else:
#         print("验证码错误")