从字典值创建新字典

Question

I have the following values in a list:

'image_result': [{'checksum': '701e172bd980177ae1311f265a753582',
               'path': 'full/ee4d4341b88168972e76c61f45b8db10b349f175.jpg',
               'url': 'http://image-url.com/ID71026700-0000-0500-0000-0000033eb03c.jpg'},
              {'checksum': 'e0b3cada2a8377913bc779a16f1d9e36',
               'path': 'full/410c964db8de6138622c1e1b3b94062b69caedc8.jpg',
               'url': 'image-url.com/ID71026700-0000-0500-0000-0000033eb03d.jpg'},
              {'checksum': '39c9a06f221ba584f691f0def0fde2c4',
               'path': 'full/574dcb9a6af1ea7b733e6986c6a10ba815ca23b4.jpg',
               'url': 'image-url.com/ID71026700-0000-0500-0000-0000033eb03e.jpg'}]

I'd like to get the 'path' value and format it to the following so it becomes a global image key:

'image': 'full/ee4d4341b88168972e76c61f45b8db10b349f175.jpg',
'image': 'full/ee4d4341b88168972e76c61f45b8db10b349f175.jpg',
'image': 'full/574dcb9a6af1ea7b733e6986c6a10ba815ca23b4.jpg'

The code I have gives me the right output as shown above, but it only saves the last 'path' value because it's overwritten in each cycle of the loop:

for x in item['image_result']:
   item['image'] = x.get('path')

These are Scrapy items and haven't been able to figure out if this is possible without overwriting the item value every time I want to insert a new one. I'm also very new to python and haven't found a way to get around this even though I researched a lot in the last few days.

Answer 1

you're not updating the sub-key, you're creating a global image key.

Do that instead:

for x in item['image_result']:
   x['image'] = x.get('path')

if you want to extract a list of images (stored as a global images key) you just need to do:

item['image'] = [x.get('path') for x in item['image_result']]