如何在 Python 中使用 for 遍历 json 元素

Question

This code works:

#!/usr/bin/env python3

import urllib.request, json

url = urllib.request.urlopen('https://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20yahoo.finance.xchange%20where%20pair%20in%20(%22DKKNOK%2CEURNOK%2CGBPNOK%2CISKNOK%2CNOKNOK%2CPLNNOK%2CSEKNOK%22)&format=json&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys')

data = json.loads(url.read().decode(url.info().get_content_charset('utf-8')))

print(data['query']['results']['rate'][:])

It prints out all the 7 element of data['query']['results']['rate'] in conjunction.

So I'm thinking this code should also work:

#!/usr/bin/env python3

import urllib.request, json

url = urllib.request.urlopen('https://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20yahoo.finance.xchange%20where%20pair%20in%20(%22DKKNOK%2CEURNOK%2CGBPNOK%2CISKNOK%2CNOKNOK%2CPLNNOK%2CSEKNOK%22)&format=json&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys')

data = json.loads(url.read().decode(url.info().get_content_charset('utf-8')))

for d in data['query']['results']['rate'][:]
    print(d)

Using for to loop and print out each of the elements in data['query']['results']['rate'] .

However this does not work and gives an error.

How can I iterate through json elements in Python?

Answer 1

There is no need for [:] to just iterate over the data:

for d in data['query']['results']['rate']:
    print(d)

.. should work. You're missing the : .

You can also use the .json() method directly on the response from requests to decode the JSON into a python structure.

Answer 2

Try this

for d in data['query']['results']['rate']：
    print(d)

instead of

for d in data['query']['results']['rate'][:]
    print(d)                       #here    ^ missed :