save project

diy2.py

+user='python'
+password='12345'
+while True:
+    a=input("输入用户名：")
+    b=input("输入密码：")
+    if user==a and password==b:
+        print("登录成功！")
+        break
+    if user!=a:
+        print("用户名错误！")
+        continue
+    if password!=b:
+        print("密码错误！")
+        continue