Dictionary Cheatsheet

Complete Python Dictionary cheatsheet with clear examples for quick revision

Example: my_dict = {'name': 'John', 'age': 25, 'city': 'New York'}

1

clear()

Removes all items from the dictionary.

my_dict.clear()  # {}

2

copy()

Creates a copy of a dictionary.

new_dict = my_dict.copy()  # {'name':'John', 'age':25, 'city':'New York'}

3

get()

Returns the value of a particular key.

my_dict.get('age')  # 25

4

items()

Returns all the items present in the dictionary as (key, value) pairs.

my_dict.items()  # (name, john), (age, 25), (city, New York)

5

keys()

Returns a list of keys in a dictionary.

my_dict.keys()  # [name, age, city]

6

values()

Returns a list of values in a dictionary.

my_dict.values()  # [john, 25, new york]

7

pop(key)

Removes the key-value pair from the dictionary.

my_dict.pop('age')  # {'name': 'John', 'city': 'New York'}

8

popitem()

Removes the last key-value pair from the dictionary.

my_dict.popitem()  # {'name': 'John', 'age': 25}

9

update()

Updates a dictionary by adding the items from another dictionary.

new_dict = {'country':'USA', 'mob_num':12345}
my_dict.update(new_dict)
# {'name': 'John', 'age': 25, 'city': ' New York', 'country':'USA', 'mob_num':12345}

10

setdefault(key, value)

Returns the value for a key if it exists. If not, inserts the key with a value of default and returns default.

my_dict.setdefault('age', 30)   # {'name': 'John', 'age': 25, 'city': 'New York'}
my_dict.setdefault('height', 175)  # {'name': 'John', 'age': 25, 'city': 'New York', 'height', 175}

11

fromkeys()

Creates a new dictionary with keys from iterable and values set to value.

new_dict = dict.fromkeys(['a', 'b', 'c'], 0)  # {'a': 0, 'b': 0, 'c': 0}