auto save

diy2.py

 username = "python"
 username = "python"
 userpassword = "123456"
 userpassword = "123456"
 while True:
 while True:
-    if i>0:
-        name = input("请输入用户名:")
-        password = input("请输入密码:")
-        if name == username and password == userpassword:
-            print("登录成功!")
-            break
-        if username!=username:
-        print("用户账号登录错误") 
-        continue
-        if userpassword!=userpassword:
-        print("用户密码登录错误") 
-        exit()
+    name = input("请输入用户名:")
+    password = input("请输入密码:")
+    if name == username and password == userpassword:
+        print("登录成功!")
+        break
+    if username!=username:
+       print("用户账号登录错误") 
+       continue
+    if userpassword!=userpassword:
+       print("用户密码登录错误") 
 print("欢迎来到贝尔编程!")
 print("欢迎来到贝尔编程!")
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