说明：turtle是Python内置的一个非常有趣的模块，特别适合对计算机程序设计进行初体验的小伙伴，它最早是Logo语言的一部分，Logo语言是Wally Feurzig和Seymour Papert在1966发明的编程语言。
1.报错：module ‘turtle’ has no attribute ‘pensize’
2.原因：py文件的名字和模块重名了，导入turtle的时候 其实导入的是自己
3.解决：将文件名称修改为其他名字。
Python报错：module ‘turtle’ has no attribute ‘pensize’
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