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Add Same Key in Python Dictionary

Dictionary keys as a list in Python

Last Updated : 06 Jan, 2025

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In Python, we will encounter some situations where we need to extract the keys from a dictionary as a list. In this article, we will explore various easy and efficient methods to achieve this.

Using list()

The simplest and most efficient way to convert dictionary keys to lists is by using a built-in list() function.

Python

d = {'a': 1, 'b': 2, 'c': 3} a = list(d.keys()) print(a)

Output

['a', 'b', 'c']

Explanation:

a.keys() returns a dict_keys object, which is a view object.
Wrapping it with list() converts the view into a list.

Using List Comprehension

List Comprehension provide concise and readable way to create a list of keys.

Python

d = {'a': 1, 'b': 2, 'c': 3} a = [key for key in d] print(a)

Output

['a', 'b', 'c']

Explanation:

Iterating directly over the dictionary yields its keys.
This method avoids calling .keys() explicitly.

Using (* )Unpacking Operator

The unpacking operator (*) can be used to extract keys directly.

Python

d = {'a': 1, 'b': 2, 'c': 3} a = [*d] print(a)

Output

['a', 'b', 'c']

Explanation:

The unpacking operator expands the dictionary keys into a list.

Using map()

map() function can be used to explicitly iterate over the dictionary.

Python

d = {'a': 1, 'b': 2, 'c': 3} a = list(map(str,d)) print(a)

Output

['a', 'b', 'c']

Explantion:

map() applies the identity function (or a custom function) to each key.
Converting the result to a list yields the desired keys.

Add Same Key in Python Dictionary

S

Smitha Dinesh Semwal

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Article Tags :

Python
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Python dictionary-programs
python-dict

Practice Tags :

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