Just a heads up: In Python 3.5, tqdm is currently generating this warning:

lib/python3.5/site-packages/tqdm/_tqdm.py:65: DeprecationWarning: sys.getcheckinterval() and sys.setcheckinterval() are deprecated.  Use sys.setswitchinterval() instead.
	  sys.setcheckinterval(100)

Which I guess can be easily solved by using sys.setswitchinterval(100). But I'll let you guys decide that, since you know exactly what's going on your internal threads.