Python3 implements a simple bank account login system example

The following editor will bring you an example of a Python3 bank account login system suitable for beginners to learn. The editor thinks it’s pretty good, so I’ll share it with you now and give it as a reference. Let’s follow the editor and take a look.

1. Knowledge points used:

1. The combination of for loop and if judgment

2. Use of %s placeholder

3. Use of auxiliary flags (flags)

4. Use of break

2. Code example:

'''
银行登录系统
'''

uname = "bob"
passwd = 123
judgment = 0
choice = 2

for i in range(3):
 username = input("请输入用户名：")
 password = int(input("请输入密码："))
 if username == uname and password == passwd: #用户名和密码必须同时成立
  print("~~~欢迎%s使用银行自助服务系统~~~" %uname) # %s是占位符
  judgment = 1
  break
 else:
  if choice != 0:
   print("！！！登陆失败！！！" + "您还有" + str(choice) + "次机会")
  else:
   print("！！！登陆失败！！！")
  choice = choice - 1
if judgment == 0:
  print("三次机会已用完，此卡将冻结10分钟") #只是提示信息，冻结操作并未编写



# 第二种思路
# uname = "bob"
# passwd = 123
#
# choice = 2
#
# for i in range(3):
#  username = input("请输入用户名：")
#  password = int(input("请输入密码："))
#  if username == uname and password == passwd:
#   print("~~~欢迎%s使用银行自助服务系统~~~" %uname) # %s是占位符
#
#   break
#  else:
#   if choice != 0:
#    print("！！！登陆失败！！！" + "您还有" + str(choice) + "次机会")
#   else:
#    print("！！！登陆失败！！！")
#   choice = choice - 1
# else:
#  print("三次机会已用完，此卡将冻结10分钟")
# 
#

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