Additional Practice

In this page are exercises that are not part of any projects but are exercises that reinforce understanding of topics.

In your Replit Python project, let us setup a separate directory for your demonstration activities. First, open up your shell and make sure you’re seeing ~/workspace. If not type cd ~/workspace. Then we’re creating a directory called demonstration by typing mkdir demonstration. To get into the demonstration directory, type cd demonstration.

2 Dimensional Lists

This exercise will help you understand how two dimensional lists work. First, create change into the demonstration directory and create new Python file called 2d-array.py by typing touch 2d-array.py.

Here are two functions that are provided to you. The first one create_2d_list creates an empty 2 dimensional list and the second print_2d_list will print that list out with some decorations.

from typing import Any

def create_2d_list(columns: int, rows: int, default_value: Any):
  list_2d = []
  for row in range(rows):
    list_2d.append([])
    for col in range(columns):
      list_2d[row].append(default_value)
  return list_2d

def print_2d_list(list_2d: list[list[Any]]):
  for row in range(len(list_2d)):
    for col in range(len(list_2d[row])):
      print("[", list_2d[row][col], "]", end=" ")
    print("\n")

print_2d_list(create_2d_list(5, 5, 0))