import pandas as pd

def open_csv(file, **kwargs):
    """
    Opens a CSV file using pandas, treating the first column as the index
    and preserving column order, which can be useful in case of rewriting to
    the same CSV.
    """
    df = pd.read_csv(file, index_col=0, **kwargs)
    col_order = open(file, 'r').readline().strip().split(",")[1:]
    return df[col_order]