python爬取人民币汇率中间价，从最权威的网站中国外汇交易中心。

首先找到相关网页，解析链接，这中间需要经验和耐心，在此不多说。

以人民币兑美元的汇率为例(CNY/USD)，脚本详情如下：

windows：

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# -*- coding: utf-8 -*-

import time

import requests

import json

t = time.time()

# 这里必须是ms级别的时间戳

timestamp = (int(round(t*1000)))

url = "http://www.chinamoney.com.cn/r/cms/www/chinamoney/data/fx/ccpr.json?t="+str(timestamp)

s = requests.Session()

r = s.post(url,data={})

sjson = json.loads(r.text)

#print sjson

for k in sjson['records']:

if k['vrtEName'] == 'USD/CNY':

print k['price']

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Linux：

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# -*- coding: utf-8 -*-

import time

import urllib

import urllib2

import json

t = time.time()

# timestamp must be ms

timestamp = (int(round(t*1000)))

url = "http://www.chinamoney.com.cn/r/cms/www/chinamoney/data/fx/ccpr.json?t="+str(timestamp)

data = urllib.urlencode({})

request = urllib2.Request(url,data)

response = urllib2.urlopen(request)

result = response.read()

rjson = json.loads(result)

for r in rjson['records']:

if r['vrtEName'] == 'USD/CNY':

return r['price']

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发现在linux环境下用request，返回的是HTML结构。

而不是data的json格式，所以在linux用urllib和urllib2