Hello everyone, Welcome back to proramminginpython.com. Here in this post am going to introduce you to one of the popular python data type – Dictionary. Lists and Tuples are some of the other data types. Dictionaries are indexed by keys and can be of any immutable type. These are unordered key-value pairs with unique keys.
Dictionary can be created simply by writing curly braces {} an example dictionary will look like {'key1': 'value1', 'key2': 'value2'}
Now let’s go through the operations that can be performed on dictionaries.
You can also watch the video on youtube here
Python Dictionary Operations – Code Visualization
Create Dictionary
I will create a dictionary named my_infoand add some key-value pairs to it.
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# add elements to dictionary my_info = { 'Name': 'Avinash', 'Age': 23, 'Gender': 'Male', 'Location': 'India', 'Website': 'programminginpython.com' } |
and print it.
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# print dictionary print(my_info) |
Accessing Values
Now I can access the elements in the dictionary by its key, here I will print the value of the key 'Name'.
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my_info = { 'Name': 'Avinash', 'Age': 23, 'Gender': 'Male', 'Location': 'India', 'Website': 'programminginpython.com' } # print value of a key print(my_info['Name']) |
Modifying values
I can also modify the existing elements in the dictionary, here I will modify the value of key 'Age'
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my_info = { 'Name': 'Avinash', 'Age': 23, 'Gender': 'Male', 'Location': 'India', 'Website': 'programminginpython.com' } # modify elements in dictionary my_info['Age'] = 24 print(my_info) |
Length of dictionary
I can also find the length of the dictionary, using the built-in method len() which gives the total number of items in the dictionary.
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my_info = { 'Name': 'Avinash', 'Age': 23, 'Gender': 'Male', 'Location': 'India', 'Website': 'programminginpython.com' } # length of dictionary print(len(my_info)) |
Delete elements
I can also delete a particular key from a dictionary, here I will delete key 'Website'
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my_info = { 'Name': 'Avinash', 'Age': 23, 'Gender': 'Male', 'Location': 'India', 'Website': 'programminginpython.com' } # delete a particular key del my_info['Website'] print(my_info) |
Similarly, I can remove all the elements using a function called clear() which empties all the elements in the dictionary
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# removes all elements in dictionary my_info.clear() |
I can also delete the entire dictionary,
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# delete entire dictionary del my_info |
These are some of the operations that can be performed on dictionaries.
The complete code for above snippets,
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__author__ = 'Avinash' # add elements to dictionary my_info = { 'Name': 'Avinash', 'Age': 23, 'Gender': 'Male', 'Location': 'India', 'Website': 'programminginpython.com' } # print dictionary print(my_info) # print value of a key print(my_info['Name']) # modify elements in dictionary my_info['Age'] = 24 print(my_info) # length of dictionary print(len(my_info)) # delete a particular key del my_info['Website'] print(my_info) # removes all elements in dictionary my_info.clear() print(my_info) # delete entire dictionary del my_info |