Working with dictionaries means three basic operation on dictionaries i.e., updating dictionary, adding elements to a dictionary and deleting elements of a dictionary.

Updating Dictionary:-

We can change the value of an existing key by using assignment.
syntax:-

dictionary_name[key]=new_value

e.g.,

a={'1':'python', '2':'Java','3':'JavaScript','4':'C'}
a['4']='C++'
print(a)

Output- {'1':'python', '2':'Java','3':'JavaScript','4':'C++'}

Adding elements to a dictionary:-

We can add elements by updating the dictionary with a new key and then assigning the value to a new key.
syntax:-

dictionary_name[key]=value

e.g.,

a={}
a['1']='Python'
print(a)

Output- {'1': 'Python'}

Deleting elements from a dictionary:-

To delete a key-value pair in a dictionary we can use del method. A disadvantage is that it gives KeyError if we try to delete a non-existence key.
syntax:-

del dictionary_name['key']

e.g.,

a={'1' :'python', '2' :'Java','3' :'JavaScript','4':'C', '5':'C++'}
del a['3']
print(a)

Output {'1' :'python', '2' :'Java','4':'C', '5':'C++'}

This is how we work in dictionaries in python.