adds the python exercise plus assets

modules/qualifying/exercise_python.md

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+# Scripting exercises - sorting files
+
+Damn it, I made a mess of my files!
+Can you sort the following picture collections for me please?
+I don't really care what ordering system you use but thousands of files in one directory is **not** practical.
+There are four different folders with files to sort and each one is a **separate** assignment so at the end I expect **four** folders with **sorted** files (and subdirectories).
+
+The files are archived and can me downloaded [here](./assets/files.tar).
+I advise you to keep a copy of the archive so you can run your scripts multiple times until you achieve a desirable outcome.
+
+## The batches
+
+### Simple filenames
+
+The first batch of files has a very straight forward filename `FUJI_20120103_171310.jpg`.
+The pictures span multiple years but are all from one single device (FUJI).
+Sort however you want but `$YEAH/$MONTH` might be a good start.
+
+### Multiple cameras and formats
+
+The second batch has pictures form multiple cameras as well as multiple file extensions.
+You can sort in multiple ways but for example `$YEAR/$CAMERA/$MONTH` or `$CAMERA/$YEAR/$MONTH`.
+The choice is yours.
+
+### Messy filenames
+
+The third batch is very messy and has not only multiple cameras and formats but also multiple date structures.
+This one will require some hefty debugging!
+
+### Recovery files
+
+The fourth batch is pretty messed up.
+No dates or logic can be found in the filenames but luckily jpg files can contain **metadata** about the files.
+This challenge will require you to search and install extra Python3 libraries to access this metadata.
+Installing will be done via `pip3` which comes with Pycharm.
+Have a look at this [library](https://github.com/TNThieding/exif) and figure out how to use it.
+It might be handy to install `imagemagick` via `sudo apt install imagemagick`.
+This gives you the ability to inspect metadata on the Linux command line via `identify -verbose BJtpWU7n7WCeOL2B84Vz.jpg`.
+
+## Some hints and tips
+
+While we *just* discovered the creation of our own objects in Python3 you don't *need* your own classes to complete these exercises.
+I would advise to create multiple **functions** and use a lot of `print()` calls to help you make sense of your `for file in files:` loops.
+You can slow down the loops with `time.sleep(1)` if the cycling feels to quick to you.
+You can make one script for each batch, or reuse the same script but create different functions for the four batches, whatever is easiest for you.
+Ask for **help** from your classmates when you're stuck.
+By explaining your problem to someone else you often come up with a solution.
+
+Now some links and phrases to google:
+
+* to **manipulate dates** in Python3, your best bet is the [datetime](https://docs.python.org/3/library/datetime.html) library
+* definitely have a look at the [strptime](https://stackabuse.com/converting-strings-to-datetime-in-python) **method** of a datetime object
+* paths can be manipulated easily with **two different** [libraries](https://www.reddit.com/r/Python/comments/l45ojr/ospath_vs_pathlib/), os **or** pathlib
+* files can be **moved** with multiple [libraries](https://stackoverflow.com/questions/8858008/how-to-move-a-file) as well