[Python]] [Pycharm the same code but a successful run, a run-time error

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He wrote a turtle graphics, similar to the previous code to run, but the other is always being given that turtle is not pensize () property.

Later reopen Pycharm, No; eventually run the wrong files deleted, re-create a file, a name changed again, to run successfully.

Suddenly, I want to understand, because the beginning of time I put the name of the file name and turtles modules written in the same, turtle. It can not find the cause.