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This problem occurs or is not installed or have the same name pyserial files, links ( https://blog.csdn.net/u010918541/article/details/51173429 ) also said, I have security, but there are still problems, then found to be incorrect installation of the serial, look before you need to import serial direct pip install serial, however useless, and pip install pyserial does not work, finally found a need to uninstall the serial, link ( https://stackoverflow.com/questions/ 11,403,932 / Python-AttributeError-Object-Module1-has-NO-attribute-Serial )
Execution: pip uninstall serial
Error disappears.