def RmCol(state, command, *columns):
    """Remove columns
    Remove specified columns.
    Example: RmCol~column1
    """
    remove = state.expand_columns(columns)
    state.log_info("Remove columns: "+(", ".join(remove)))
    keep = [c for c in state.columns if c not in remove]

    df = state.df()
    return state.with_df(df.loc[:,keep])