auto save

diy2.py

-username = "python"
-userpassword = "123456"
+username = "python"     #将用户名设为python
+userpassword = "123456"  #将密码设为123456
 while True:
-    name = input("请输入用户名:")
-    if name!=username: 
-        print("用户名错误")
-        continue
-    password = input("请输入密码:")
-    if name == username and password == userpassword:
-        print("登录成功!")
-        break
+    name = input("请输入用户名:")    #输入用户名
+    if name!=username:    #如果用户名错误
+        print("用户名错误")   #提示用户名错误
+          continue  #取消一次循环
+    password = input("请输入密码:")     #输入密码
+    if name == username and password == userpassword:   #判断用户名和密码是否正确
+        print("登录成功!")  #提示登录成功
+        break     #取消这次循环
     
-    if password!=userpassword:
-        print("密码错误")
-   
-print("欢迎来到贝尔编程!")
+    if password!=userpassword:    #如果密码错误
+        print("密码错误")   #提示密码错误
    
+print("欢迎来到贝尔编程!")   #提示欢迎来到贝尔编程
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