Dictionaries in Python

Table of Contents

Skills Required

• Setup python development environment
• Basic Printing in Python
• Commenting in Python
• Managing Variables in python

Please make sure to have all the skills mentioned above to understand and execute the code mentioned below. Go through the above skills if necessary for reference or revision

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A Dictionary contains a set of key-value pairs encapsulated in it

Create a dictionary

# create a dictionary
x = {'firstname': 'Nagasudhir', 'lastname': 'Pulla'}

Access a value using it’s key

# create a dictionary
xDict = {
    'firstName': 'Nagasudhir',
    'lastname': 'Pulla',
    'age': 28,
    'hobbies': ['tv', 'playing', 'youtube'],
    'location': 'Mumbai',
    'metaData': {
        'proficiency': 'level 1',
        'designation': 'Deputy Manager',
        'department': 'IT',
        'languages': ['C#', 'Javascript', 'HTML', 'CSS', 'typescript', 'python']
    }
}
# access firstName value
print(xDict['firstName'])
# prints Nagasudhir
# access lastname value
print(xDict['lastname'])
# prints Pulla
outputStatement = 'The person name is {0} {1}.\nHe lives at {2}, his hobbies are {3}.\nHe knows {4}'\
    .format(xDict['firstName'], xDict['lastname'], xDict['location'],
            ', '.join(xDict['hobbies']), ', '.join(xDict['metaData']['languages']))
print(outputStatement)
''' This should print
The person name is Nagasudhir Pulla.
He lives at Mumbai, his hobbies are tv, playing, youtube.
He knows C#, Javascript, HTML, CSS, typescript, python
'''

Check if dictionary has a key using “in” operator

# create a dictionary
x = {'firstname': 'Nagasudhir', 'lastname': 'Pulla'}
print('firstname' in x)
# prints True
print('somethingElse' in x)
# prints False

List out all the keys and values of a dictionary

# create a dictionary
x = {'firstname': 'Nagasudhir', 'lastname': 'Pulla'}
# print all the keys
print(list(x.keys()))
# prints ['firstname', 'lastname']
# print all the values
print(list(x.values()))
# prints ['Nagasudhir', 'Pulla']

Create / Edit values in a dictionary

# create a dictionary
x = {'firstname': 'Nagasudhir', 'lastname': 'Pulla'}
# change firstname
x['firstname'] = 'Sudhir'
# create a new property with key as 'age'
x['age'] = 28
# print the dictionary
print(x)
# prints {'firstname': 'Sudhir', 'lastname': 'Pulla', 'age': 28}

Video

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