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 and password != userpassword:
-        print("密码和账号错误!请重新输入")
-        continue
-    if name != username :
-        print(("用户名错误!请重新输入")
-        continue
-    if  password != userpassword:
-        print("密码错误!请重新输入")
-        continue
-    exit()
+    i-=1
+    if i>0:
+        if name == username and password == userpassword:
+            print("登录成功!")
+            break
+        if name != username and password != userpassword:
+            print("密码和账号错误!请重新输入")
+            print('温馨提示您还有'+str(i)+"次机会")
+            continue
+        elif name != username:
+            print(("用户名错误!请重新输入")
+        else: 
+            print("密码错误!请重新输入")
+    else:
+        exit()
 print("欢迎来到贝尔编程!")
\ No newline at end of file