Created by: v-jizhang
Summary: The function attributes named func_X have been renamed to use the X form in Python3, https://docs.python.org/3/whatsnew/3.0.html#operators-and-special-methods and also built-in changes https://wiki.python.org/moin/Python3.0#Built-In_Changes. The old names can't be used in Python3. This PR changes the old names to new names to make buck Python3 compatible. Python2 was EOL on 1/1/2020, https://github.com/Homebrew/homebrew-core/issues/49796. Pull Request resolved: https://github.com/facebook/buck/pull/2391
Reviewed By: philipjameson, v-jizhang
Pulled By: v-jizhang
shipit-source-id: c00dae81ea0e0356ebacb2429ddee26bb8fe9362