Introduction
In Python, a 2D list is a list of lists. It is a useful data structure for representing grids, tables, and matrices. Initializing a 2D list involves creating a list of lists with a given width and height and initializing each element with a default value.
Initialize 2D List
Write a function initialize_2d_list(w, h, val=None) that initializes a 2D list of given width and height and value. The function should return a list of h rows where each row is a list with length w, initialized with val. If val is not provided, the default value should be None.
def initialize_2d_list(w, h, val = None):
return [[val for x in range(w)] for y in range(h)]
initialize_2d_list(2, 2, 0) ## [[0, 0], [0, 0]]
Summary
In this challenge, you learned how to initialize a 2D list in Python. You used a list comprehension and range() to generate h rows where each is a list with length w, initialized with a default value. You also learned how to set the default value to None if no value is provided.