fix format variable

[cg-cnu]

A variable format is used which is a reserved keyword in python.
Change that to something like output_format.
Fixed the issue but need to test out, will do a pr soon! 😄

[mottosso]

I wouldn't be too fussed about this particular use, partly because it's originally one from cmds.playblast(format="") but also because the function referenced by the keyword isn't used in the scope within which it is being used.

In general, if shadowing a keyword improves overall readability, I think it's ok. Put another way, if adhering to PEP08 reduces readability, then I'd say it's safe to ignore the particular warning.

[cg-cnu]

I agree with you, that's why I left it in the initial pr. Since we are planning for pylinting on travis, thought this might error out. I am not sure if we can tune the pylinter to ignore this case 🙂