[code-quality] How is pycodestyle invoked?

Hi Devs, Thanks for flake8! My code is now less flakey. I'm seeing W503 on a particular file, which from RTFM'ing, I know is from pycodestyle. When I run pycodestyle on that file, I don't see W503. That means flake8 is invoking pycodestyle with some command-line options. I looked in the source for flake8 and couldn't find where this was. I looked at the options for flake8 and didn't see anything that looked like it would report how pycodestyle was being invoked. How is pycodestyle being invoked? Thanks for the help.