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Modules

It would be a massive pain if we had to fit all of our code into a single file. So, let's organize our code into separate modules.

Since each .py file is a module, we can group related functions, variables, and classes together in a module. Then, other modules can import them using the syntax:

from module_name import my_function
# or import everything: from module_name import *

Constants

Games often have a lot of magic numbers to represent things like player speeds, item costs, and attack damage. We'll use a dedicated module as a place to store those kinds of constant values.

Assignment

Create a new file in your project called constants.py (in the same folder as main.py), and paste this in:
```
SCREEN_WIDTH = 1280
SCREEN_HEIGHT = 720
```
Import SCREEN_WIDTH and SCREEN_HEIGHT from the constants.py file into main.py.
After the "Starting Asteroids..." message, also print out the SCREEN_WIDTH and SCREEN_HEIGHT values when main.py is run, using the format below:
```
Screen width: 1280
Screen height: 720
```

Run and submit the CLI tests.