" Python

highlight BadWhitespace ctermbg=red guibg=red

" Python, PEP-008
au BufRead,BufNewFile *.py,*.pyw set expandtab
au BufRead,BufNewFile *.py,*.pyw set textwidth=139
au BufRead,BufNewFile *.py,*.pyw set tabstop=4
au BufRead,BufNewFile *.py,*.pyw set softtabstop=4
au BufRead,BufNewFile *.py,*.pyw set shiftwidth=4
au BufRead,BufNewFile *.py,*.pyw set autoindent
au BufRead,BufNewFile *.py,*.pyw match BadWhitespace /^\t\+/
au BufRead,BufNewFile *.py,*.pyw match BadWhitespace /\s\+$/
au BufNewFile *.py,*.pyw let fileformat=unix
au BufRead,BufNewFile *.py,*.pyw let b:comment_leader = '#'

autocmd BufWritePost *.py call Flake8()

let g:flake8_show_in_gutter=1  " show


" How can I open a NERDTree automatically when vim starts up if no files were   specified?
 
autocmd StdinReadPre * let s:std_in=1
autocmd VimEnter * if argc() == 0 && !exists("s:std_in") | NERDTree | endif
 
" How can I map a specific key or shortcut to open NERDTree?
map <C-n> :NERDTreeToggle<CR>

" How can I close vim if the only window left open is a NERDTree?
autocmd bufenter * if (winnr("$") == 1 && exists("b:NERDTree") && b:NERDTree.   isTabTree()) | q | endif


" Easier VIM split navigations
nnoremap <C-J> <C-W><C-J>
nnoremap <C-K> <C-W><C-K>
nnoremap <C-L> <C-W><C-L>
nnoremap <C-H> <C-W><C-H>