Python List Comprehenion Get JSON Values

Question

I have a JSON like:

data = [
    {"word": "Hi", "lang": "en"},
    {"word": "Bonjour", "lang": "fr"},
    ...
]

I want to execute a function (named db.insertIntoSwearWords) for each key-value pair. This is what I've done so far

words = [item['word'] for item in data]
langs = [item['lang'] for item in data]
res = [db.insertIntoSwearWords(words[i], langs[i]) for i in range(len(words))]
result = [{'word': words[i], 'result': res[i]} for i in range(len(words))]
print(jsonify(result))

which gives me:

[
    {"result": true, "word": "Hi"},
    {"result": true, "word": "Bonjour"},
    ...
]

MY PROBLEM: Just wondering if there is any better way to write this program with fewer lines. I'm not a fan of for i in range() really. I'm just curious how can I do the list comprehension with for word, lang in item syntax.

What's the point of the words and langs lists? You could zip them to save iterating over a range, but why not just e.g. result = [{"word": d["word"], result: db.insertIntoSwearWords(d["word"], d["lang"])} for d in data}. — jonrsharpe
– jonrsharpe, Commented Apr 12, 2021 at 8:13
Since it seems you have working code and are looking for general improvements, this appears to more appropriate for CodeReview – be sure to check their question guide first, though. — MisterMiyagi
– MisterMiyagi, Commented Apr 12, 2021 at 8:20
Extracting two separate lists of variables isn't helpful since they later get recombined back into their original pairs at the point they're fed into the function. I was thinking zip as well, but it's not necessary given the task. edit Ahh, which is precisely the point @jonrsharpe makes above with more clarity. — Thomas Kimber
– Thomas Kimber, Commented Apr 12, 2021 at 8:31

its5Q · Accepted Answer · 2021-04-12 08:15:28Z

1

You can use the built-in zip function. For example:

>>> a = [1, 2, 3]
>>> b = ['a', 'b', 'c']
>>> c = [(i, j) for i, j in zip(a, b)]
>>> c
[(1, 'a'), (2, 'b'), (3, 'c')]

Also, you can do

>>> list(zip(a, b))
[(1, 'a'), (2, 'b'), (3, 'c')]

Which gives the same result.

answered Apr 12, 2021 at 8:15

its5Q

1084 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

azro Over a year ago

When you answer,please provide a specific (to the question) solution, a generic solution is not a good way to answer ;)

its5Q Over a year ago

@azro thanks for pointing that out, I will be more specific in the future :)

Tabaraei Over a year ago

What you're suggestion is I replace third line with res = [db.insertIntoSwearWords(word, lang) for word,lang in zip(words,langs)], that's helpful. but still the code is ugly and I'm trying to write a neat code. Isn't there a better way than parsing word/lang separately and zipping them back?

Collectives™ on Stack Overflow

Python List Comprehenion Get JSON Values

1 Answer 1

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related