save project

diy2.py

 username = "python"
 username = "python"
 userpassword = "123456"
 userpassword = "123456"
+i=3
 while True:
 while True:
-    name = input("输入用户名")
-    password = input("输入密码")
-    if name == username and password == userpassword:
-        print("登录成功!")
-        break
-    print("用户名和密码错误!请重新输入")
-while True():
-    if name!=username:
-        break
-    print("用户名错误!请重新输入")
-while True():
-    if password != userpassword:
-        break
-    print("密码错误!请重新输入")
+    i>0
+        name = input("输入用户名")
+        password = input("输入密码")
+        if name == username and password == userpassword:
+            print("登录成功!")
+            i-=1
+            break
+        print("用户名和密码错误!请重新输入")
+        if name!=username:
+            break
+        print("用户名错误!请重新输入")
+        if password != userpassword:
+        print("密码错误!请重新输入")
 print("欢迎来到贝尔编程!")
 print("欢迎来到贝尔编程!")
\ No newline at end of file