Conditional Count in Python

Question

If I have the following:

team = [
    {'name': 'Ben', 'age': 31, 'country': 'France', 'hobbies': ['coding', 'biking']},
    {'name': 'Quinn', 'age': 26, 'country': 'Ireland', 'hobbies': ['skiing']},
    {'name': 'Sasha', 'age': 24, 'country': 'Lebanon', 'hobbies': ['sports']},
    {'name': 'Alex', 'age': 28, 'country': 'Austria', 'hobbies': []}
]

How can I cound the items in ‘hobbies’ for an person, let’s say Ben. I tried let(), sum(), and some If statements, but none work. Maybe I’m just wrong with the syntax or missing a step. Any help to point me in the right direction?

How would I be able to print the number of hobbies listed for example, for Ben 2, for Sasha 1, etc.

Asked By: Kayan

||

Source

Answer 1

Use len, like so:

team = [
    {'name': 'Ben', 'age': 31, 'country': 'France', 'hobbies': ['coding', 'biking']},
    {'name': 'Quinn', 'age': 26, 'country': 'Ireland', 'hobbies': ['skiing']},
    {'name': 'Sasha', 'age': 24, 'country': 'Lebanon', 'hobbies': ['sports']},
    {'name': 'Alex', 'age': 28, 'country': 'Austria', 'hobbies': []}
]


for player in team:
    print('%s has %d hobbies' % (player['name'], len(player['hobbies'])))

Output:

Ben has 2 hobbies
Quinn has 1 hobbies
Sasha has 1 hobbies
Alex has 0 hobbies

Answered By: little_birdie

Answer 2

Well, you could try something like:

counts = {person["name"]:len(person.get("hobbies",[])) for person in team}

Answered By: WArnold

Answer 3

Or you can use .__len__() for solution:

team = [
    {'name': 'Ben', 'age': 31, 'country': 'France', 'hobbies': ['coding', 'biking']},
    {'name': 'Quinn', 'age': 26, 'country': 'Ireland', 'hobbies': ['skiing']},
    {'name': 'Sasha', 'age': 24, 'country': 'Lebanon', 'hobbies': ['sports']},
    {'name': 'Alex', 'age': 28, 'country': 'Austria', 'hobbies': []}
]

for person in team:
    if person["hobbies"].__len__() > 1:
        print(person["name"],"has",str(person["hobbies"].__len__()),"hobbies")
    else:
        print(person["name"],"has",str(person["hobbies"].__len__()),"hobby")

output:

Ben has 2 hobbies
Quinn has 1 hobby
Sasha has 1 hobby
Alex has 0 hobby

Answered By: ak8893893

Conditional Count in Python

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