the pyflakes.vim plugin requires Vim to be compiled with +python

去github重新下载一个pyflakes.vim。

git clone --recursive git://github.com/kevinw/pyflakes-vim.git

进到 ./pyflakes-vim/ftplugin

cd ./pyflakes-vim/ftplugin

将python 文件拷贝到 ~/.vim/ftplugin目录下

sudo cp -r ./python/ ~/.vim/ftplugin/

完美解决