def rename_col(tbl):
    """Convert column names as per snakelowercase standards"""
    tbl.columns = tbl.columns.str.strip().str.lower()
    pairs = [(' ', '_'), ('_x', '_'), ('_y', '_'), ('.', '_'), (',', '_'),
        ('/', '_'), ('(', '_'), (')', '')]
    for a, b in pairs:
        tbl.columns = tbl.columns.str.replace(a, b)
    return tbl.columns
