Add utf8 info usage at beginning of python file given as 1rst arg

gistfile1.txt

#!/bin/bash
line=$(head -n 1 $1)
# need to be fixed below
if ! [ $line="# coding: utf-8" ]; then
    printf '%s\n' "# coding: utf-8" | cat - $1 > $1.n && mv $1.n $1
fi;

# use like:
# find -iname '*.py' ! -path "./venv3.5/*" -exec ./u.sh {} \;