[英]Unexpected KeyError: in Python 2.7.10
我是Python編碼的新手,我的代碼遇到了意外錯誤。 任何幫助,將不勝感激
import json
from urllib2 import urlopen
response = urlopen("https://finance.yahoo.com/webservice/v1/symbols/allcurrencies/quote?format=json")
source = response.read()
# print(source)
data = json.loads(source)
# print(json.dumps(data, indent=2))
usd_rates = dict()
for item in data['list']['resources']:
name = item['resource']['fields']['name']
price = item['resource']['fields']['price']
usd_rates[name] = price
print name, price
由於在“資源”>“字段”下沒有標簽“名稱”,因此出現錯誤。
您可以添加檢查,是否始終不會獲得標簽“名稱”:
name = item['resource']['fields'].get('name', '')
使用get從json / dict中獲取值,並使用None檢查。
import json
from urllib2 import urlopen
response = urlopen("https://finance.yahoo.com/webservice/v1/symbols/allcurrencies/quote?format=json")
source = response.read()
# print(source)
data = json.loads(source)
# print(json.dumps(data, indent=2))
usd_rates = dict()
for item in data['list']['resources']:
name = item.get('resource').get('fields').get('name')
price = item.get('resource').get('fields').get('price')
if name is not None:
usd_rates[name] = price
print name, price
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