save project

1.py

+user='python'
+userpassword="1223"
+a=input("用户名：")
+b=input("密码：")
+while True:
+    if a==user and b==userpassword:
+        print("登录成功！")
+        break
+    if a!=user:
+        print("用户名错误！请重新输入！")
+        a=input("用户名：")
+    if b!=userpassword:
+        print("密码错误！请重新输入！")
+        b=input("密码：")
+print("welcome!")
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