从嵌套在列表中的字典中获取值？

Question

I'm pulling data out from the facebook API, what it returns is essentially a nested JSON looking file.

I've piped the data into the a pandas dataframe and one of the columns has returned a series of dictionaries nested in a list. (see examples in the code below).

How on Earth do I extract the values from each variable (ie a, b, c) when the action_type = landing_page_view?

ie in variable a, how do I extract the value when searching for specific action types?

ie return 44, 96 and 116 when I want to search the variables for 'landing_page_view'?

I've tried various for loops and things of that nature but I am not having any luck. I'm at a loss...

a = [{'action_type': 'landing_page_view', 'value': '44'}, {'action_type': 'link_click', 'value': '102'}, {'action_type': 'post_reaction', 'value': '5'}, {'action_type': 'post_engagement', 'value': '107'}, {'action_type': 'page_engagement', 'value': '107'}]

b = [{'action_type': 'comment', 'value': '1'}, {'action_type': 'landing_page_view', 'value': '96'}, {'action_type': 'link_click', 'value': '285'}, {'action_type': 'post_reaction', 'value': '25'}, {'action_type': 'post_engagement', 'value': '311'}, {'action_type': 'page_engagement', 'value': '311'}]

c = [{'action_type': 'post_reaction', 'value': '11'}, {'action_type': 'landing_page_view', 'value': '116'}, {'action_type': 'link_click', 'value': '319'}, {'action_type': 'post_engagement', 'value': '330'}, {'action_type': 'page_engagement', 'value': '330'}]

Answer 1

for item in a:
    if item['action_type'] == 'landing_page_view':
        print(item['value'])

Repeat for b and c .

Answer 2

You can access it like you would normally but with the list and position in the begining

example:

lists = [{'hello':'world', 'bye':'world'}]
print (lists[0]['hello'])
lists[0]['hello'] = "user"
print (lists[0]['hello'])

output:

world
user

Answer 3

一线解决方案：

[item['value'] for item in a if item['action_type'] == 'landing_page_view']

Answer 4

I feel like Jonathan's approach is best for this!

[item['value'] for item in a if item['action_type'] == 'landing_page_view']

Answer 5

Here's another way of doing it for those who don't like list comprehensions so much:

from cherrypicker import CherryPicker
picker = CherryPicker(a)
picker(action_type='landing_page_view')['value'].get()

Install cherrypicker with pip install --user cherrypicker . Read about more advanced usage in the docs: https://cherrypicker.readthedocs.io .