How to Create a Dictionary in Python?

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🖥️ How to Create a Dictionary in Python?

Creating a dictionary in Python is as simple as placing “key: value” items inside curly braces {}, and separated by comma. Each key is separated from its associated value by a colon “:”.

Let’s have a closer look at the syntax of a Dictionary in Python

Here is an example, in which you want to store an employee record. First, Let’s declare an empty dictionary – using the curly braces {}. Eventually, you will then add all of the personal information about the employee, so you can store its information and then access it later.

     employee = {
          'age': 27,
          'city': 'Paris',
          'job': 'Youtuber',
          'name': 'Digital Academy',
          'email': 'digital.academy@free.fr'
     }

You can also convert two-value sequences into a dictionary, using the built-in function dict() in Python. The first item inside each sequence is then used as the key, and the second as the value.

# Using dict() constructor
my_dict = dict({'name':'apple', 2:'strawberry'})
     
# From sequence, having each item as a pair
my_dict = dict([('name','Digital Academy'), ('age',27)]) # List of Tuples
my_dict = dict((['name','Digital Academy'], ['age',27])) # Tuple of Lists
     
# my_dict = {'name': 'Digital Academy', 'age': 27}

When the keys are simple strings, it is sometimes easier to specify key:value pairs, using keyword arguments.

my_dict = dict(
         age = 27,
         job = 'Youtuber',
         name = 'Digital Academy'
     )
     
# my_dict = {'name': 'Digital Academy', 'age': 27, 'job': 'Youtuber'}

—

Dictionaries are pretty straightforward, but here are a few points you should be aware of:

○ Keys must be unique

A key can appear in a dictionary only once. Even if you specify a key more than once during the creation of a dictionary, the last value for that key becomes the associated value.

my_dict = {
          'age': 27,
          'name': 'Jérémy',
          'name': 'Digital Academy'
     }
     
# my_dict = {'name': 'Digital Academy', 'age': 27}

○ Key must be Immutable type

You can use any object of immutable type as dictionary keys – such as numbers, strings, booleans, tuples. Otherwise an exception is raised, when mutable object is used as a key.

my_dict = {
          0: 1,                             # Number
          True: 'a',                        # Boolean
          (2,2): 25,                        # Tuple
          [2,2]: 25,                        # TypeError: unhashable type: 'list'
          'name': 'Digital Academy'         # String
     }

○ Value can be of any type

There are no restrictions on dictionary values. A dictionary value can be any type of object, and can even appear in a dictionary, multiple times.

 # Values of different datatypes
my_dict = {
      'a': [1,2,3], # List
      'b': {1,2,3}  # Set
}
     
# Duplicate values
my_dict = {
      'a': [1,2], # List a
      'b': [1,2], # List b
      'c': [1,2]  # List c
}

Let’s play this video, stick around and watch until the end of this video! 👍🏻

– Digital Academy™ 🎓

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☞ WATCH NEXT:
○ Data Types in Python – https://youtu.be/cweUByxBWiU
○ Operators in Python – https://youtu.be/-wDaVLkKOiU
○ IF Statements in Python – https://youtu.be/CC5seZ6OBJ4
○ FOR Loops in Python – https://youtu.be/JgH-D5DSTho

☞ WATCH MORE:
○ HOW TO Learn Python? Python Tutorial for Beginners [FULL Course] https://youtu.be/9hvnSZPMtuw

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