Using tqdm in the context of a shell returns an undefined error and hangs:

$ find . -name '*.py' -exec cat \{} \; | tqdm | wc -l

Error:
Usage:
  tqdm [--help | options]
^\Quit

I suspect this is an installation problem, since it works for me on another computer, but I uninstalled and reinstalled from conda to no avail. I have no clue how to fix this.