Dictionary Methods

Dictionary uses several built-in methods for manipulation.They are listed below

update()

The update() method updates the value of the key provided to it if the item already exists in the dictionary, else it creates a new key-value pair.

Example:

info = {'name':'Karan', 'age':19, 'eligible':True}
print(info)
info.update({'age':20})
info.update({'DOB':2001})
print(info)

Output:

{'name': 'Karan', 'age': 19, 'eligible': True}
{'name': 'Karan', 'age': 20, 'eligible': True, 'DOB': 2001}

Removing items from dictionary:

There are a few methods that we can use to remove items from dictionary.

clear():

The clear() method removes all the items from the list.

Example:

info = {'name':'Karan', 'age':19, 'eligible':True}
info.clear()
print(info)

Output:

{}

pop():

The pop() method removes the key-value pair whose key is passed as a parameter.

Example:

info = {'name':'Karan', 'age':19, 'eligible':True}
info.pop('eligible')
print(info)

Output:

{'name': 'Karan', 'age': 19}

popitem():

The popitem() method removes the last key-value pair from the dictionary.

Example:

info = {'name':'Karan', 'age':19, 'eligible':True, 'DOB':2003}
info.popitem()
print(info)

Output:

{'name': 'Karan', 'age': 19, 'eligible': True}

del:

we can also use the del keyword to remove a dictionary item.

Example:

info = {'name':'Karan', 'age':19, 'eligible':True, 'DOB':2003}
del info['age']
print(info)

Output:

{'name': 'Karan', 'eligible': True, 'DOB': 2003}

If key is not provided, then the del keyword will delete the dictionary entirely.

Example:

info = {'name':'Karan', 'age':19, 'eligible':True, 'DOB':2003}
del info
print(info)

Output:

NameError: name 'info' is not defined