I have the following version of python import sys print(sys.version) 3.6.5 | packaged by conda-forge | (default, Apr 6 2018, 13:44:09) [GCC 4.2.1 Compatible Apple LLVM 6.1.0 (clang-602.0.53)] I installed a package with the following command pip install wfdb It is succesfully installed because when I then write the command: pip show wfdb The following information appears Location: /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages However, when I type the command import wfdb in Python notebook or the version of python in terminal, I get the following message No module named 'wfdb' Does it have to do with the path on which python is checking where the packages are? How to check this and how to change it? Continue reading...