What does python 3s dictionary update () method do?

Description

The method update[] adds dictionary dict2's key-values pairs in to dict. This function does not return anything.

Syntax

Following is the syntax for update[] method −

dict.update[dict2]

Parameters

dict2 − This is the dictionary to be added into dict.

Return Value

This method does not return any value.

Example

The following example shows the usage of update[] method.

#!/usr/bin/python3

dict = {'Name': 'Zara', 'Age': 7}
dict2 = {'Sex': 'female' }

dict.update[dict2]
print ["updated dict : ", dict]

Result

When we run above program, it produces the following result −

updated dict : {'Sex': 'female', 'Age': 7, 'Name': 'Zara'}

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Python Dictionary update[] method updates the dictionary with the elements from another dictionary object or from an iterable of key/value pairs.

Syntax: dict.update[[other]]
Parameters: This method takes either a dictionary or an iterable object of key/value pairs [generally tuples] as parameters.
Returns: It doesn’t return any value but updates the Dictionary with elements from a dictionary object or an iterable object of key/value pairs.

Python Dictionary update[] Example

Example #1: Update with another Dictionary

Python3

Dictionary1 = {'A': 'Geeks', 'B': 'For', }

Dictionary2 = {'B': 'Geeks'}

print["Original Dictionary:"]

print[Dictionary1]

Dictionary1.update[Dictionary2]

print["Dictionary after updation:"]

print[Dictionary1]

Output:

Original Dictionary:
{'A': 'Geeks', 'B': 'For'}

Dictionary after updation:
{'A': 'Geeks', 'B': 'Geeks'}

Example #2: Update with an iterable

Python3

Dictionary1 = {'A': 'Geeks'}

print["Original Dictionary:"]

print[Dictionary1]

Dictionary1.update[B='For', C='Geeks']

print["Dictionary after updation:"]

print[Dictionary1]

Output:

Original Dictionary:
{'A': 'Geeks'}

Dictionary after updation:
{'C': 'Geeks', 'B': 'For', 'A': 'Geeks'}

Example #3: Python dictionary update value if the key exists

Python3

def checkKey[dict, key]:

if key in dict.keys[]:

print["Key exist, ", end =" "]

dict.update[{'m':600}]

print["value updated =", 600]

else:

print["Not Exist"]

dict = {'m': 700, 'n':100, 't':500}

key = 'm'

checkKey[dict, key]

print[dict]

Output:

Key exist,  value updated = 600
{'m': 600, 'n': 100, 't': 500}