SublimeText shuffle selection command

shuffle.py

import sublime, sublime_plugin, random

class ShuffleCommand(sublime_plugin.TextCommand):
    def run(self, edit):
        regions = self.view.sel()
        selections = [self.view.substr(s) for s in regions]
        selections = [shuffle_string(s) for s in selections]
        for i in range(len(selections)):
            self.view.replace(edit, regions[i], selections[i])

def shuffle_string(s):
    return ''.join(shuffle_list(list(s)))

# need to be used from sort.py, but how to import that file ?
def shuffle_list(l):
    random.shuffle(l)
    return l