Getting a value from a particular dictionary from a list of dictionaries

Question

Suppose I have the following list of dictionaries:

months = [
    {'id':'001','date':'January'},
    {'id':'002','date':'February'},
    {'id':'003','date':'March'},
    {'id':'004','date':'April'},
    {'id':'005','date':'May'},
    {'id':'006','date':'June'},
    {'id':'007','date':'July'},
    {'id':'008','date':'August'},
    {'id':'009','date':'September'},
    {'id':'010','date':'October'},
    {'id':'011','date':'November'},
    {'id':'012','date':'December'},
]

If the user enters the month as January, he should get the ID as 001.

I tried this, but it returns me a list of Months only.

res = [ mon['date'] for mon in months]

I need the id directly from the key itself. How can I achieve that ?

score 6 · Accepted Answer · answered Dec 28 '19 at 13:10

6

You can use the month as the key in a dictionary:

res = {mon['date']: mon['id'] for mon in months}
print(res['January'])

answered Dec 28 '19 at 13:10

Anonymous

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score 1 · Answer 2 · answered Dec 28 '19 at 13:09

1

You convert what you have to a dict that maps from months to ids

new_dict = {item['date']: item['id'] for item in months}

answered Dec 28 '19 at 13:09

blue_note

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score 1 · Answer 3 · answered Dec 28 '19 at 13:31

1

I hope this code will work for you.

month_name = input("Enter month name.")
dic = next(item for item in months if item["date"] == month_name)
id = dic["id"]
print(id)

I have tested this code on my local, and it works good.

answered Dec 28 '19 at 13:31

ysk silver

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score 0 · Answer 4 · answered Dec 28 '19 at 13:12

0

it should be id instead of date

res = [ mon['id'] for mon in months]

answered Dec 28 '19 at 13:12

hithyshi

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I need date only and not id, as that is my particular requirement – Vai Dec 28 '19 at 13:19

score 0 · Answer 5 · answered Dec 28 '19 at 13:13

0

Use if to filter within the list comprehension:

id = [m['id'] for m in months if m['date'] == 'January'][0]

answered Dec 28 '19 at 13:13

Nick Lee

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Getting a value from a particular dictionary from a list of dictionaries

5 Answers5