如何用python给csv里的数据排序

#coding:utf-8

import re

import argparse

import pandas as pd

parser = argparse.ArgumentParser(description='manual to this script')

parser.add_argument('--ip', type=str, default = None)

parser.add_argument('--type', type=str, default=None)

args = parser.parse_args()

filterStr = args.ip + " " + args.type

f1=file('perf.csv','r')

perfdata=f1.readlines()

f1.close()

results = []

f2 = open('filter.csv', 'w')

f2.writelines(perfdata[0])

for i in perfdata:

    n = re.findall(filterStr, i)

    if n:

        f2.writelines(i)

f2.close()

df = pd.read_csv('filter.csv')

df = df.sort_values('elapsed',ascending = False)

df.to_csv('filterOrder.csv',index = False)