save project

diy2.py

 username = "python"
 username = "python"
 userpassword = "123456"
 userpassword = "123456"
+i=0
 while True:
 while True:
+    if i == 3
+       break
+    else:
+        i+=1
+        
     name = input("请输入用户名:")
     name = input("请输入用户名:")
     password = input("请输入密码:")
     password = input("请输入密码:")
-    if name == username and password == userpassword:
+    if name == username
+
         print("登录成功!")
         print("登录成功!")
+
         break
         break
-        if name !=username:
-            print("用户名不存在,请重新输入!")
-        if password != userpassword:
-            print("密码输入有误,请重新输入!")
-    print("用户名和密码错误!请重新输入")
+        else:
+        if name =username:
+            if password ==username :
+                print("登陆成功!")
+                print("欢迎来到贝尔编程！")
+                break
+            else:
+                print("密码错误！")
+                print("您还有"+str(3-i)+"次机会")
+        else:
+            print("密码错误！") 
+            print
+    
 print("欢迎来到贝尔编程!")
 print("欢迎来到贝尔编程!")
\ No newline at end of file