save project

diy2.py

+i=3
 username = "python"
 userpassword = "123456"
 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 username!=name:
-        print("用户名错误")
-    if userpassword!=password:
-        print("密码错误")
-        continue
+        if i>0:
+        name = input("请输入用户名:")
+        password = input("请输入密码:")
+        i=i-
+        if name == username and password == userpassword:
+            print("登录成功!")
+            break
+        if username!=name:
+            print("用户名错误")
+            continue
+        if userpassword!=password:
+            exit()
+            print("密码错误")
+