How to Create List of Dictionary in Python Using For Loop

In Python programming, creating a list of dictionaries is a common task, particularly when dealing with structured data. In this article, we will discuss various approaches to create a list of dictionaries in Python using a for loop.

Create a List of Dictionary in Python Using For Loop

Below are some of the ways by which we can create List of Dictionary in Python Using For Loop:

• Using zip() with For Loop
• Using List Comprehension
• Using enumerate() Function

Create a List of Dictionary Using zip() with For Loop

In this example, a list of dictionaries, `list_of_dicts`, is created using a list comprehension and the `zip` function to combine keys (‘key’ and ‘value’) with corresponding values generated in a for loop ranging from 0 to 2. Each dictionary represents an iteration with ‘key’ as the iteration value and ‘value’ as twice the iteration value.

Python3

keys = ['key', 'value']

list_of_dicts = [dict(zip(keys, [i, i * 2])) for i in range(3)]

print(list_of_dicts)

Output

[{'key': 0, 'value': 0}, {'key': 1, 'value': 2}, {'key': 2, 'value': 4}]

Create a List of Dictionary Using List Comprehension

In this example, a list of dictionaries, `list_of_dicts`, is generated using a list comprehension. Each dictionary within the list has keys ‘key’ and ‘value’, where ‘key’ corresponds to the iteration value from 0 to 2, and ‘value’ is twice the iteration value. The resulting list is then printed, showcasing a compact approach for creating dictionaries with specified keys and dynamic values.

Python3

list_of_dicts = [{'key': i, 'value': i * 2} for i in range(3)]

print(list_of_dicts)

Output

[{'key': 0, 'value': 0}, {'key': 1, 'value': 2}, {'key': 2, 'value': 4}]

Create a List of Dictionary Using enumerate() Function

In this code snippet, a list of fruits (`fruits`) and a corresponding list of prices (`prices`) are defined. An empty list (`fruit_info`) is initialized to store dictionaries containing information about each fruit. Using a for loop and the enumerate() function to track the index (`i`), dictionaries are created for each fruit, incorporating its name and the corresponding price. The final list of dictionaries (`fruit_info`) is then printed, providing information about each fruit along with its respective price.

Python3

# Define a list of fruits
fruits = ["Apple", "Orange", "Banana"]

# Define a list of corresponding prices for each fruit
prices = [5, 3, 2]

# Initialize an empty list to store dictionaries containing fruit information
fruit_info = []

# Iterate over each fruit in the list of fruits
for i, fruit in enumerate(fruits):
    # Append a dictionary containing the name of the fruit and its corresponding price
    fruit_info.append({"name": fruit, "price": prices[i]})

# Print the list of dictionaries containing fruit information
print(fruit_info)

Output

[{'name': 'Apple', 'price': 5}, {'name': 'Orange', 'price': 3}, {'name': 'Banana', 'price': 2}]