Introduction Python Dictionary update() Method with Examples

Introduction Python Dictionary update() Method with Examples

The update() method updates the dictionary with the elements from the another dictionary object or from an iterable of key/value pairs.

Python dict update() method updates the dictionary with the elements from another dictionary object or an iterable of key/value pairs. Dict update() method adds element(s) to a dictionary if the key is not in the dictionary. If the key is in a dictionary, it updates the key with a new value.

Python Dictionary update()

Syntax

dict.update([other])


Here dict is the dictionary in which we want to update, and other is the dictionary from which we want to copy.

Return Value

The dict update() method does not return anything, and it just updates one dictionary with other dictionary objects or iterable key/pairs.

Python Dictionary update() Method Example

Example 1

If element (key/value) pair is already presents in the dictionary, it will overwrite it. See an example below.


# Python dictionary update() Method  
# Creating a dictionary  
einventory = {'Fan': 200, 'Bulb':150, 'Led':1000,'cooler':50}  
print("Inventory:",einventory)  
# Calling Method  
einventory.update({'cooler':50})  
print("Updated inventory:",einventory)  
einventory.update({'cooler':150})  
print("Updated inventory:",einventory)  

Output:


Inventory: {'Fan': 200, 'Bulb': 150, 'Led': 1000, 'cooler': 50}
Updated inventory: {'Fan': 200, 'Bulb': 150, 'Led': 1000, 'cooler': 50}
Updated inventory: {'Fan': 200, 'Bulb': 150, 'Led': 1000, 'cooler': 150}

Example 2

The update() method also allows iterable key/value pairs as parameter. See, the example below two values are passed to the dictionary and it is updated.


# Python dictionary update() Method  
# Creating a dictionary  
einventory = {'Fan': 200, 'Bulb':150, 'Led':1000}  
print("Inventory:",einventory)  
# Calling Method  
einventory.update(cooler=50,switches=1000)  
print("Updated inventory:",einventory)  

Output:


Inventory: {'Fan': 200, 'Bulb': 150, 'Led': 1000}
Updated inventory: {'Fan': 200, 'Bulb': 150, 'Led': 1000, 'cooler': 50, 'switches': 1000}

Example 3

It is a simple example to update the dictionary by passing key/value pair. This method updates the dictionary. See an example below.


# Python dictionary update() Method  
# Creating a dictionary  
einventory = {'Fan': 200, 'Bulb':150, 'Led':1000}  
print("Inventory:",einventory)  
# Calling Method  
einventory.update({'cooler':50})  
print("Updated inventory:",einventory)  

Output:


Inventory: {'Fan': 200, 'Bulb': 150, 'Led': 1000}
Updated inventory: {'Fan': 200, 'Bulb': 150, 'Led': 1000, 'cooler': 50}

In these examples we can see Python Dictionary update() method updates the dictionary with the elements from another dictionary object or an iterable of key/value pairs.

Thanks for reading !

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