--- a/.vimrc	Fri Jan 18 20:41:51 2019 +0800
+++ b/.vimrc	Fri Jan 18 20:42:56 2019 +0800
@@ -110,7 +110,7 @@
 au FileType python call s:check_if_python3()
 
 fun! s:check_if_python3()
-    if getline(1) =~ '#!.*python3'
+    if getline(1) =~ '#!.*\<python3\>'
         let g:syntastic_python_checkers=["pyflakes3"]
     endif
 endfun