[Python] Getting ModuleNotFoundError even after a successful pip install

I am trying to install the SimPy module so that I can use it in IDLE. However, everytime I try to import in IDLE, I got an error. I already tried reinstalling Python and Pip and tried to modify the location of the apps. SimPy can be found in the directory of Python 2.7. I'm using python 3.6.1.

After I correctly installed simpy in the terminal:

pip install simpy
Requirement already satisfied: simpy in /Library/Python/2.7/site-packages


When I put into IDLE:

Import Simpy


I got the error:

Traceback (most recent call last):
File "<pyshell#3>", line 1, in <module>
import simpy
ModuleNotFoundError: No module named 'simpy'


How can I solve this?

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