1 year, 8 months ago

A Quick Look at List Comprehension

A for loop in python is the go-to control flow structure for writing a block of code that has to repeat itself a set number of times. However python has a useful shortcut for such an operation called a comprehension. In particular python has a feature called list comprehension where the code is like a one-line for loop that creates a new list from an existing one. The pseudocode for a list comprehension is shown below:

my_new_list = [expression for item in my_old_list]

Let's break this code down. The magic happens inside the brackets. The expression acts on the item to create a new value for my_new_list. The code iterates through my_old_list and the expression performs some action each item adding a new value to my_new_list at each iteration. We can also use a conditional expression inside the brackets the tells the code to put the new value in my_new_list only if a certain condition is true. The pseudocode is as follows:

my_new_list = [expression for item in my_old_list if expression]

Category: Python Programming

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