auto save

1.py

+import turtle
+screen=turtle.Screen()
+screen.bgcolor("light blue")
+len=screen.textinput("100","100")
+len=int(len)
+pen=turtle.Pen()
+turtle.color("red")
+turtle.begin_fill()
+turtle.left(45)
+turtle.forward(2*len)
+turtle.circle(len,180)
+turtle.right(90)
+turtle.circle(len,180)
+turtle.forward(2*len)
+turtle.end_fill()
+turtle.bgcolor("black")
+turtle.penup()
+turtle.goto(100,-100)
+turtle.write("你好!",font=("黑体",40,"bold"))
+turtle.hideturtle()
+turtle.down
+
+
+

2.py

+while True:
+    user="n"
+    ps="222333"
+    b=input("输入用户名：")
+    c=input("输入密码：")
+    if user==b and ps==c:
+        print("登录成功")
+        break
+print("欢迎来到魔兽世界")
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4.3.py

+username="python"
+userpassword="123456"
+while True:
+    a=input("username:")
+    b=input("userpassword")
+    if username==a and userpassword==b:
+        print("登录成功")
+        break
+print("欢迎进入系统!")
\ No newline at end of file