Introduction to FrozenList

FrozenList is a powerful utility for working with immutable lists in Python. It provides a rich set of APIs which allow developers to work more efficiently and write cleaner code. In this article, we’ll explore dozens of useful APIs provided by the FrozenList library along with code snippets.

API Examples

Creating a FrozenList

To create an immutable list, you can use the FrozenList class:

 from frozenlist import FrozenList
fl = FrozenList([1, 2, 3, 4]) print(fl) 

Accessing Elements

You can access elements in a FrozenList just like in a regular list:

 first_element = fl[0] print(first_element) 

Length of the FrozenList

To get the length of a FrozenList, you can use the len() function:

 length = len(fl) print(length) 

Iterating Over FrozenList

You can iterate over a FrozenList using a for loop:

 for item in fl:
    print(item)

Checking Membership

To check if an item is in a FrozenList, you can use the in keyword:

 is_present = 2 in fl print(is_present) 

Index of an Element

You can find the index of an element using the index() method:

 index_of_two = fl.index(2) print(index_of_two) 

Count Occurrences

You can count the occurrences of an element using the count() method:

 count_of_twos = fl.count(2) print(count_of_twos) 

Converting to List

If you need a mutable version of the FrozenList, you can convert it to a regular list:

 mutable_list = list(fl) print(mutable_list) 

App Example with FrozenList APIs

Let’s create a simple application to demonstrate the use of these APIs. This application will filter out even numbers from a FrozenList and return a new FrozenList.

 from frozenlist import FrozenList
def filter_even_numbers(fl):
    return FrozenList([num for num in fl if num % 2 != 0])

# Create a FrozenList numbers = FrozenList([1, 2, 3, 4, 5, 6])
# Apply the filter filtered_numbers = filter_even_numbers(numbers) print(filtered_numbers) 

This app showcases how you can leverage the immutable nature of FrozenList to create robust and reliable applications.

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