Python Dictionary update() method with Examples

Python Dictionary update() method with Examples on clear(), copy(), fromkeys(), get(), len(), items(), keys(), setdefault(), values(), ascii(), enumerate(), update(), pop() etc.

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Python Dictionary update() Method

Python update() method updates the dictionary with the key and value pairs. It inserts key/value if it is not present. It updates key/value if it is already present in the dictionary.

It also allows an iterable of key/value pairs to update the dictionary. like: update(a=10,b=20) etc.

Signature and examples of this method are given below.

Signature

update([other])

Parameters

other: It is a list of key/value pairs.

Return

It returns None.

Let?s see some examples of update() method to understand it?s functionality.

Python Dictionary update() Method Example 1

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}

Python Dictionary update() Method Example 2

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}

Python Dictionary update() Method Example 3

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}

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Python Dictionary update() method with Examples

Python Dictionary update() Method

Signature

Parameters

Return

Python Dictionary update() Method Example 1

Python Dictionary update() Method Example 2

Python Dictionary update() Method Example 3

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