save project

diy2.py

 username = "python"
 userpassword = "123456"
+i=3
+
 while True:
-    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 name!=username:
-        if password!=userpassword:
-            print("你是谁")
-            if name!=username:
-                if password!=userpassword:
-                    print("密码错误")
-                    name = input("你是什么用户名:")
-                else:
-                    print("用户名错误")   
-              
-        else:
-            print("用户名错误")   
+    if i>0:
+        name = input("请输入用户名:")
+        password = input("请输入密码:")
+        i=i-1
+        if name == username and password == userpassword:
+            print("登录成功!")
+            exit()
+        if name!=username:
+            if password!=userpassword:
+                print("你是谁")
+                if name!=username:
+                    if password!=userpassword:
+                        print("密码错误")
+                        name = input("你是什么用户名:")
+                    else:
+                        print("用户名错误")   
+                
+            else:
+                print("用户名错误")   
               
-    if password!=userpassword:
-        print("密码错误")
+        if password!=userpassword:
+            print("密码错误")
     
 print("欢迎来到贝尔编程!")
\ No newline at end of file