def parse_env(Env):
    """Convert list of strings into dict object.
    Docker Inspect ENV is a list of strings. Env strings are
    in the form of KEY=VALUE. Split strings into key=value pairs
    and return dict object. Only return keys with "good_stuff".
    """
    env = {}
    good_stuff = ['USER', 'PASS', '_DB']
    for item in Env:
        (keyval, value) = item.split('=')
        for target in good_stuff:
            if keyval.find(target) != -1:
                env[keyval] = value
    return env