Solution: you only need to install pyserial instead of serial. If serial has been installed, you can uninstall it.
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solution: open pychar on your computer and find that it can run. PIP list shows that only pyserial is installed, After importing serial, click in to see the specific method. It is found that the init.py of the serial on the computer is different from that on the raspberry pie
the raspberry pie on the computer is basically empty. You can run it after uninstalling the serial discovery program
I don’t know why all bloggers on Baidu search need to install serial and pyserial