save project

diy1.py

+i=3
 username = "python"    
 userpassword = "123456"    
 while True:
-    name = input("用户名")
-    password = input("密码")
-    if name == username and password == userpassword:
-        print("成功") 
-        break
-    if name != username:
-        print("用户错误，重新输入")
-        continue
-    if password != userpassword:        
-        print("密码错误，重新输入")
+    if i>0:
+        name = input("用户名")
+        password = input("密码")
+        i-=1
+        if name == username and password == userpassword:
+            print("成功") 
+            break
+        if name != username:
+            print("用户错误，重新输入")
+            continue
+        if password != userpassword:        
+            print("密码错误，重新输入")
+    else:
+        print("锁定")
+        exit()
 print("欢迎")