save project

diy2.py

-import turtle
-screen=turtle.Screen()
-screen.bgcolor("black")
-pen=turtle.Pen()
-colors=["red","orange","yellow","green"]
-for i in range(1,300):
-    pen.color(colors[i%4])
-    pen.forward(i)
-    pen.right(91)
-turtle.hideturtle()
-turtle.done()
+username="phthon"
+userpassword="123456"
+while True:
+    name=input("请输入账号")
+    password=input("请输入密码")
+    if name==username and password==userpassword:
+            print("登录成功")
+            break
+    elif name!=username:
+        print("账号不存在,请重新输入")
+    else :
+        print("账号不存在,请重新输入")
+    print("账号密码错误")
+print("欢迎来到贝尔世界")
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