--- a/.vimrc	Wed Feb 28 21:45:12 2018 +0800
+++ b/.vimrc	Wed Feb 28 21:48:46 2018 +0800
@@ -107,6 +107,14 @@
 let g:syntastic_javascript_checkers=["jshint"]
 let g:syntastic_javascript_jshint_exec="~/node_modules/jshint/bin/jshint"
 
+au FileType python call s:check_if_python3()
+
+fun! s:check_if_python3()
+    if getline(1) =~ '#!.*python3'
+        let g:syntastic_python_checkers=["pyflakes3"]
+    endif
+endfun
+
 " signify
 let g:signify_vcs_list = ["git", "hg"]