[Python] NoModuleFound Error even when I install the module

I am trying to import some libs, including:

from past.builtins import xrange


problem is, I keep getting this error:

ModuleNotFoundError: No module named 'past'


I've successfully installed and upgraded future, both localy AND on my virtualenv:

C:\Users\JON>pip install future
C:\Users\JON>pip install --upgrade future
(.env) C:\Users\JON>pip install future
(.env) C:\Users\JON>pip install --upgrade future


still, when I run this import on Jupyter I get the error above.
I should mention I'm using Windows 10 and Anaconda+Jupyter for python 3.6

Anybody has an idea why this happens and how to fix it?

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