I always forget this, then I get desperate searching the forums and thinking I must be doing something wrong, and looking at older sketches where it worked just fine, jut to realize this:
print(sketchPath('data')) # wrong!
def setup():
print(sketchPath('data'))
Result:
/home/villares/processing-3.5.4/data <-this is wrong!
/home/villares/sketchbook/sketch_2020_10_28c_sketchPath/data