The challenge was this long song with long and short beeps
Using pysoundfile I wrote the first script strange_sound.py, which transforms the .vaw in an array of values. These values are then analysed and transformed in 1 or 0. Using it, I created the strange.dat file (python3 strange_sound.py > strange.dat).
The second script strange2.py is then used. It opens the previously created file strange.dat, and writes it in a file as binary data.
The output file was firstly created without extension, and using exiftools on the file showed us it was a png file.