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 and password!=userpassword:
-        print("Unknow name")
-    elif name!=username:
-        print("Unknow name")
-    elif password!=userpassword:
-        print("Password was wrong")
-print("欢迎来到贝尔编程!")
\ No newline at end of file
+    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("Unknow name")
+            i-=1
+            continue
+        elif password!=userpassword:
+            print("Password was wrong")
+            i-=1
+    else:
+        print("Can't login!")
+        exit()
+print("Welcome")
\ No newline at end of file