nvie/vim-flake8 — pull request #25 by 5t111111 (2014-04-27 00:39:36+00:00)
Title: Failed when a file path has space in it.

Put double quotes around a file path because flake8 cannot find a correct file path when a file path has space in it.
ThoughI have tested only on MacVim and Gvim on Windows, it should work on other platforms.