What Is Dictionary Write Example of Dictionary Data Type?


Larry Thompson

What Is Dictionary?

A dictionary is a data type in Python that stores data in a key-value pair format. It is also known as an associative array or hash map in other programming languages.

The key-value pairs within a dictionary are enclosed in curly brackets {} and separated by commas. The keys are unique, immutable objects, while the values can be of any data type.

Example of Dictionary Data Type:

To better understand the concept of dictionaries, let’s dive into an example. Suppose we want to store information about a student, such as their name, age, and grade. We can create a dictionary to hold this information as follows:

students = {
  "name": "John Doe",
  "age": 18,
  "grade": 12

In this example, the keys are “name”, “age”, and “grade”, while the corresponding values are “John Doe”, 18, and 12 respectively.

Accessing Dictionary Values:

We can access the values in a dictionary by using their corresponding keys. For example, to retrieve the student’s name from the above dictionary, we can use the following code:

name = students["name"]
print(name) # Output: John Doe

Modifying Dictionary Values:

Dictionaries allow us to modify values associated with existing keys or add new key-value pairs. Let’s say we want to update the student’s grade from 12 to 11:

students["grade"] = 11
print(students) # Output: {'name': 'John Doe', 'age': 18, 'grade': 11}

Dictionary Methods:

Python provides various built-in methods to perform operations on dictionaries. Here are a few commonly used ones:

  • keys(): Returns a list of all the keys in the dictionary.
  • values(): Returns a list of all the values in the dictionary.
  • items(): Returns a list of key-value pairs (as tuples) in the dictionary.
  • get(key): Returns the value associated with the specified key. If the key is not found, it returns None or a default value provided as an argument.


# Using keys() method
print(students.keys()) # Output: ['name', 'age', 'grade']

# Using values() method
print(students.values()) # Output: ['John Doe', 18, 11]

# Using items() method
print(students.items()) # Output: [('name', 'John Doe'), ('age', 18), ('grade', 11)]

# Using get() method
age = students.get("age")
print(age) # Output: 18

grade = students.get("grades", "N/A")
print(grade) # Output: N/A

In conclusion,

The dictionary data type in Python is a powerful tool for storing and manipulating data in a key-value pair format. Its flexibility and efficiency make it invaluable for various programming tasks. By understanding how to create dictionaries, access their values, modify them, and utilize built-in methods, you can leverage this data structure to enhance your Python programs.

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