def drop_col(df, col):
    """
    If a pandas.DataFrame has a particular column, drop it.

    args
    ----
        df      :   pandas.DataFrame
        col     :   str

    returns
    -------
        pandas.DataFrame, same DataFrame without column
    
    """
    if col in df.columns:
        df = df.drop(col, axis=1)
    return df