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    Lab 9: Weekly Exercises
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# Lab 9: Tracing, Testing, and Files

[This week's lab
exercises](/exercises/ex08_nested_loops_files_tracing/ex08_nested_loops_files_tracing.zip) introduce you to
how to write your own `optimism` tests, give you practice with 'tracing'
your code by adding `print` statements, and include more exercises on
file operations.

Follow the link above, download and open the notebook if you don't
already have it open, and use the table of contents to jump down to the
"Lab exercises" part. With your partner, work through the exercises
there.


## What's Next?

The next part of this lab is an ungraded challenge which will require you
to use the Thonny debugger to figure out what a hidden program is doing
so that you can steal the secret password to decode a message.

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