为每次迭代创建新的csv列列表

Question

我正在尝试编写一个看起来像this的csv文件。我得到的是this，其中所有数据都输出为两个长列。这是代码。

import requests
import csv

item_dictionary = {'10350': 'Third-Age Full', '560':'Death Rune'}
item_ids = item_dictionary.keys()
url_template = 'http://www.grandexchangecentral.com/include/gecgraphjson.php?jsid=%r'

sites = []
for i in range(0, len(item_ids)):
    result = url_template % item_ids[i]
    sites.append(result)


def data_grabber(item): 
    url = item
    r = requests.get(url, headers={'Referer': 'www.grandexchangecentral.com'})
    data = r.json  
    prices = [i[1] for i in data]
    return prices


data = map(data_grabber, sites)

names = item_dictionary.values()

filler = []
for i in range(0,365):
    filler.append(None)


myfile = open('prices.csv', 'wb')
headers = [names[0], 'Percent Change', None, names[1], 'Percent Change', None]
wr = csv.writer(myfile)
wr.writerow(headers)   

for x in data:
    q = data.index(x) 
    a = data[q]
    percents = [100.0 * a1 / a2 - 100 for a1, a2 in zip(a[1:], a)]
    percents.insert(0, None)
    f = zip(data[q], percents, filler)
    wr.writerows(f)


myfile.close()

我认为问题出在f = zip(data[q], percents, filler)上。它似乎写为data[0]，然后再写为data[1]下面的{{1}}，当我想要它创建两个新列时。有没有人对如何纠正这个有任何想法？感谢。