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:
-        print("用户名错误")
-
-    if password!=userpassword:
-        print("密码错误")
-    print("用户名和密码错
-    !!!!!
-    11111111111误!请重新输入")
+    i-=1
+    if i > 0:
+        if name == username and password == userpassword:
+            print("登录成功!")
+            break
+        if name!=username:
+            print("用户名错误")
+            continue
+        if password!=userpassword:
+            print("密码错误")
+        print("用户名和密码错")
 print("欢迎来到贝尔编程!")
-!!!!!
-11111111111
\ No newline at end of file
+