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!")
-    print("用户名和密码错误!请重新输入")
-print("欢迎来到贝尔编程!")
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+    if i>0:
+        name = input("请输入用户名:")
+        password = input("请输入密码:")
+        i -= 1
+        if name == username and password == userpassword:
+             print("登录成功!")
+             break
+        if name != username:
+             print("用户名和密码错误!请重新输入")
+             print("温馨提示:您还有"+str(i)+"次登录机会")
+             continue
+        if password != userpassword:
+             print("密码输入有误，请重新输入")
+    else:
+        print("您的次数已用完")
+        break
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