2024-heraklion-ODD/exercises/exercises2023/Exercise 2 Importing.md

Exercise 2: Importing

Goal

Get comfortable with different ways of importing objects from a package.

Preparation

0. [if not done already] fork the repository

   https://github.com/ASPP/2023-heraklion-ODD and clone it to the laptop in a new directory

1. You will be editing files within this directory

2. Open a terminal and change to this directory, so that you can run the scripts that you are editing

Tasks

1. Work on the file brewing/example_usage_within_package.py:

   1. import and call the make_example_potion function from the module brew_potions.py function ➔ open a terminal, change to the brewing directory and run the script example_usage_within_package.py: what happens?
   2. change the import statement so that you can call the make_example_potion function like this: br.make_example_potion ➔ run the script again: what happens?

2. Work on the file example_usage_outside_package.py, which is in the directory where you cloned the repo:

   1. import the brewing package inside the example_usage_outside_package.py that lives at the top level directory of the repo ➔ in the terminal, change to the top level directory of the repo, add the import statement and run the script example_usage_outside_package.py: what happens?
   2. import and call only the make_example_potion function from the module brew_potions.py, which is in the brewing directory ➔ run the script again: what happens?
   3. does it work? if yes, why? If no, why not?
   4. change the import statements so that it works, then check whether brewing/example_usage_inside_package.py from 1.2 still works.

3. Work on the file scripts_and_notebooks/example_usage_different_folder.py:

   1. try to import and call only the make_example_potion function from the module brew_potions.py ➔ in the terminal, change to the scripts_and_notebooks directory and run the script example_usage_different_folder.py: what happens?
   2. does it work? if yes, why? If no, why not?