How to create dictionary in python?

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Aryan Kumar · Answer

In Python, you can create a dictionary by enclosing a comma-separated list of key-value pairs in curly braces {}. Each key-value pair consists of a key, followed by a colon :, and then the corresponding value.

Here's an example of creating a dictionary that maps names to ages:

my_dict = {'Alice': 25, 'Bob': 30, 'Charlie': 35}

You can also create an empty dictionary and add key-value pairs to it later using square bracket notation []:

my_dict = {}
my_dict['Alice'] = 25
my_dict['Bob'] = 30
my_dict['Charlie'] = 35

You can also use the dict() constructor to create a dictionary from a list of tuples, where each tuple represents a key-value pair:

my_list = [('Alice', 25), ('Bob', 30), ('Charlie', 35)]
my_dict = dict(my_list)

Once you have created a dictionary, you can access its values by using square bracket notation to specify the key:

age = my_dict['Alice']
print(age)  # Output: 25

Krishnapriya Rajeev · Answer

Dictionaries in Python are used to store data values in a key: value pair, unlike other data types that can hold only single values as an element. It is a collection that is ordered, and mutable and does not allow for duplicate values.

We can create a dictionary in Python as follows:

dict = {
"name": "John",
"age": 25,
"place": "London",
"job": "Engineer"
}

The values can be of any data type and can be duplicated, however, the keys cannot be duplicated and must be immutable. The keys are also case-sensitive.

We can add elements to a dictionary by using a new index key and assigning a value to it.

dict["nationality"] = "UK"

The update() method can be used to update the items within a dictionary. If the item does not exist, it will be added.

dict.update({"age": 28})

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How to create dictionary in python?

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