Get a list of BASH alias definitions (requires Python 3.5+)

get_aliases.py

from subprocess import PIPE, run, STDOUT

def get_aliases():
    aliases = []
    for line in run(["bash", '-i'], input='alias', stdout=PIPE, stderr=PIPE,
                    env={'PS1': ''}, encoding='utf-8').stdout.splitlines():
        name, cmd = line.split('=', 1)
        aliases.append((name[6:], cmd[1:-1]))
    return aliases