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 name!=username   :
-        print("用户名错误!请重新输入")
-    elif password!=userpassword :
-        print("密码错误")
+    if i>0 :
+        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!请重新输入")
+            i=i-1
+        elif password!=userpassword :
+            print("密码错误")
+    if i==0:
+        exit()
 print("欢迎来到贝尔编程!")
\ No newline at end of file