How to install a package that can be used by the python in PsychoPy?

Coding
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I want to install a package that can be used by the python interpreter of PsychoPy. The command “pip install the_package” only installs the package for the regular python 2.7 installed under C:\Python27, so it can be imported correctly in that python interpreter. But when I run “import the_package” in the PsychoPy shell, it gives error “ImportError: No module named the_package”. So how can I install the package I need for the python of PsychoPy, for example, what is the pip command for PsychoPy? Thanks a lot!

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This looks a lot like this topic: Installing Matlab Engine to Psychopy

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Thank you for the reply. I later added the paths to PYTHONPATH environment variable so PsychoPy can see the package I need. Specifically, I want pydevd so that I can debug the code line by line in PyCharm, so I add:
C:\Program Files (x86)\JetBrains\PyCharm 2016.1.2\helpers;C:\Program Files (x86)\JetBrains\PyCharm 2016.1.2\debug-eggs\pycharm-debug.egg
to PYTHONPATH. Then, I’m good to enjoy the PyCharm’s IDE and debugger.

Thank you again for the help.

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zzzzz in future please tick “solution” to the correct answer so we can see this topic is finished