add multiple values to dictionary key python

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Obnoxious Oystercatcher answered on November 3, 2021 Popularity 1/10 Helpfulness 1/10

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add multiple values to dictionary key python

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# adding value to key without checking existence

# First way - using 'setdefault'

d = {}  # defines the dict
d.setdefault(key, []).append(value)  # add to dict of lists
d.setdefault(key, {})[sub_key] = value  # add to dict of dictionaries


# Second way - using 'defaultdict'

from collections import defaultdict

# For dict of lists
d = defaultdict(list)
d[key].append(value)

# For dict of dictionaries
d = defaultdict(dict)
d[key][sub_key] = value

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Contributed on Mar 31 2025

Obnoxious Oystercatcher

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add multiple values to a key python

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key = "somekey"
a.setdefault(key, [])
a[key].append(1)
a[key].append(2)

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Source: stackoverflow.com

Tags: add

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Contributed on Nov 03 2021

Frightened Fly

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add two dictionary values python

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{k: dict1.get(k, 0) + dict2.get(k, 0) for k in dict1.keys() | dict2.keys()}

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Source: stackoverflow.com

Tags: add

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Contributed on Sep 17 2022

khalil tekil

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add multiple entries to a list of dictionaries python

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travel_log = [
{"country": "France", "visits": 12,"cities": ["Paris", "Lille", "Dijon"]},
{"country": "Germany","visits": 5, "cities": ["Berlin", "Hamburg", "Stuttgart"]
},]
#function ot add new items to list of dictionary items
def add_new_country(add_country, add_visits, add_cities):
   travel_log.append(
       {"country": add_country, 
         "visits": add_visits, 
         "cities": add_cities})
#Function called to update items within the list
add_new_country("Russia", 2, ["Moscow", "Saint Petersburg"])
print(travel_log[-1])#prints the last item in the list
#Results: {'country': 'Russia', 'visits': 2, 'cities': ['Moscow', 'Saint Petersburg']}

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Contributed on Sep 20 2022

Jeremy L

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document.querySelector('video')?.removeAttribute('disablepictureinpicture');

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Contributed on Mar 24 2025

Mr. Samy

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add multiple values to dictionary key python

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