fill_pits update messages issue

[dan771]

I'm not sure if this is an issue relating to a newer python version but for some reason time.sleep(float32(0.001)) on line 113 produces:
TypeError: 'numpy.float32' object cannot be interpreted as an integer

I thought this might be an issue with the god forbid from numpy import * perhaps cluttering the workspace but I managed to recreate it in seperate environment. Replacing it with just time.sleep(0.001) just seems to spam the console producing nonsense messages like:
n_closed = 12195000 of 8604750