Initialize 2D list

Python, List · Nov 2, 2020

Initializes a 2D list of given width and height and value.

  • Use a list comprehension and range() to generate h rows where each is a list with length h, initialized with val.
  • Omit the last argument, val, to set the default value to 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]]

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