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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def _get_user_gnupghome(user):
    '''
    Return default GnuPG home directory path for a user
    '''
    if user == 'salt':
        gnupghome = os.path.join(__salt__['config.get']('config_dir'), 'gpgkeys')
    else:
        gnupghome = os.path.join(_get_user_info(user)['home'], '.gnupg')

    return gnupghome