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Python Dictionary | keys method

schedule Aug 11, 2023
Last updated
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Python's dict.keys() method returns a view object displaying the keys of a dictionary as a list.

NOTE

View objects provide a dynamic view on the dictionary’s entries, which means that when the dictionary changes, the view objects reflect these changes.

Parameters

No parameters.

Return value

A view object displaying the keys of the dictionary as a list.

Examples

Basic usage

To return a view object displaying the keys of scores dictionary:

scores = {'Andrew': 77, 'Matt': 80, 'Bob': 90}
scores.keys()
dict_keys(['Andrew', 'Matt', 'Bob'])

Dynamic behavior

To check whether the returned view object includes the newly added key 'Ben':

scores = {'Andrew': 77, 'Matt': 80, 'Bob': 90}
print("Original Keys: ", scores.keys())

scores.update({'Ben': 99})
print("Updated Keys: ", scores.keys())
Original Keys: dict_keys(['Andrew', 'Matt', 'Bob'])
Updated Keys: dict_keys(['Andrew', 'Matt', 'Bob', 'Ben'])

We can see the returned view object now includes the newly added key 'Ben'.

Related

Looping through keys in a dictionary in Python
We can loop through the keys (disregarding the values) in a dictionary using the dict.keys() method.
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Published by Isshin Inada
Edited by 0 others
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Official Python Documentation
https://docs.python.org/3/library/stdtypes.html#dict.keys
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