PyCharm无法引入turtle是为啥？

PyCharm Python无法引入turtle是为啥？
源代码如下：

from turtle import *
speed (1000)
pensize (2)
colormode (255)
bgcolor (230,230,230)
penup ()
goto (-200,-200)
pendown ()
for i in range (8):
    for j in range (8):
         if ( i + j )%2==0:
            fillcolor ("black")
         else:
             fillcolor ("white")
         begin_fill ()
         for k in range (4):
             forward (50)
             left (90)
         end_fill()
         forward (50)
    penup()
    goto(-200,-200+50* i +50)
    pendown ()
#写字
write ("国际象棋棋盘", font =("隶书",30,"normal "))

你的电脑是有配置这个库吗

在pycharm中安装这个库就好了