Search in List of dict Python

Question

I have a list with some dicts inside. The list looks like this:

files = [
{'name': "text.txt", 'size': 10, 'location': "cloud", 'info': "Nothing"},
{'name': "img.jpg", 'size': 200, 'location': "local", 'info': "private"},
{'name': "cars.txt", 'size': 109, 'location': "cloud", 'info': "private"}
]

I also have a folder where "text.txt", "img.jpg" and "cars.txt" are located. Somehow I have to get all elements where "location" is "cloud" AND "info" is "Nothing".

The only way to sort the data is by using the "next" function

next((item for item in files if item["location"] == "cloud"), None)

What is the fastest way to achieve this? And also to sort by "location" and "info"?

Asked By: n1c0t1n3

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Source

Answer 1

Using list comprehension, Just iterate throught the dictionaries and get the names.

files = [dic['name'] for dic in files if dic['location'] == 'cloud' and dic['info'] == "Nothing"])
print(files)

Output:

['text.txt']

Answered By: Equinox

Answer 2

One of the way will be this

list(filter(lambda x: x["location"]=="cloud" and x["info"]=="Nothing",files))
# [{'name': 'text.txt', 'size': 10, 'location': 'cloud', 'info': 'Nothing'}]

If you just want the names:

list(map(lambda x: x["name"], filter(lambda x: x["location"]=="cloud" and x["info"]=="Nothing",files)))
# ['text.txt']

Answered By: Deepak Tripathi

Answer 3

I’ll use this as an opportunity to put in a plug for jmespath, one of my favorite Python packages for working with structured data.

jmespath, the language, defines a path syntax for locating information embedded in JSON documents (as would be created via json.load(s)).

In your case the solution would be.

In [3]: jmespath.search("[?location == 'cloud' && info == 'Nothing'].name", files)
Out[3]: ['text.txt']

Queries can compiled ahead of time.

In [4]: my_search = jmespath.compile("[?location == 'cloud' && info == 'Nothing'].name")

In [5]: my_search.search(files)
Out[5]: ['text.txt']

The time invested in learning the path language pays off pretty quick.

Answered By: Ray Pelletier

Search in List of dict Python

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