相当新的蟒蛇,新手开发者,第一次来电者的Python:默认字典键,以避免KeyError异常
我打电话一些JSON和分析有关数据为csv。我无法弄清楚如何用默认键填充中间的json Dict文件,因为很多都是未填充的。结果是KeyError,因为我试图将内容解析为csv。会爱任何建议!
谢谢。
更新:谢谢大家!现在我收到一个“NoneType”错误(制造商):
import urllib2, json, csv, sys, os, codecs, re
from collections import defaultdict
output = 'bb.csv'
csv_writer = csv.writer(open(output, 'w'))
header = ['sku', 'name', 'description', 'image', 'manufacturer', 'upc', 'department', 'class', 'subclass']
csv_writer.writerow(header)
i=1
while i<101:
print i
bb_url = urllib2.Request("http://api.remix.bestbuy.com/v1/products(sku=*)?show=sku,name,description,image,manufacturer,upc,department,class,subclass&format=json&sort=sku.asc&page=" + str(i) + "&pageSize=100&apiKey=*****************")
bb_json = json.load(urllib2.urlopen(bb_url))
print bb_json
for product in bb_json['products']:
row = []
row.append(product['sku'])
if product['name']:
row.append(str((product['name']).encode('utf-8')))
else:
row.append("")
row.append(str(product.get('description',"")))
row.append(str(product['image'])+ " ")
if product['name']:
row.append(str(product.get('manufacturer',"").encode('utf-8')))
else:
row.append("")
row.append(str(product.get('upc','').encode('utf-8')))
row.append(str((product['department']).encode('utf-8')))
row.append(str((product['class']).encode('utf-8')))
row.append(str((product['subclass']).encode('utf-8')))
csv_writer.writerow(row)
i = i+1
感谢您的协助。该行会在for循环之前插入,或者迭代在? – Kenfucious
默认值为无 –
每当您通常访问密钥时。所以当你去获取产品的名字而不是'row.append(product ['name'])'时,你可以使用'row.append(product.get('name','value if name name key does not exist' ))' –