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Linear Algebra

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Linear Algebra

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1. Vectors

Introduction Position vectors lock_openUnlock all 50+ topics

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Python Dictionary | keys method

schedule Mar 5, 2023

Last updated

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Parameters Return value Examples Basic usage Dynamic behavior

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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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