raise errors.NotSupportedError( mysql.connector.errors.NotSupportedError: Authentication plugin caching_sha2_password is not supported
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raise errors.NotSupportedError( mysql.connector.errors.NotSupportedError: Authentication plugin 'caching_sha2_password' is not supported -
You have probably installed mysql-connector instead of mysql-connector-python. So you need to install it again for python3:
pip3 install mysql-connector-python