How can I install a library in an environment?

pip install
virtualenv install
python virtual environment windows
venv vs virtualenv
conda create environment
install pip mac
python virtual environment ubuntu

I'm currently using python 3.6.5. My assignment requires python 2. So I created an environment with python 2.7 in Pycharm. I want to install the numpy library. However, it cannot be installed by using Pycharm. Pycharm hints to install via terminal. My operating System is Win10 and the path of python 2.7 is


I tried

pip2 install numpy

It returns

'pip2' is not recognized as an internal or external command,
operable program or batch file.

How can I solve it?

Before you can use pip in the terminal, you need to add it to the environment variables:

This page will guide you: link

Installing Packages, They have their own installation directories and they don't share libraries with other virtual environments. Currently, there are two common tools for creating Python  can we will install an Anaconda module on ARC3 too. To use Anaconda, run: module load anaconda. This will make available the Conda package management tool, but it will not load any environment. You may wish to load and use the ‘base’ environment which has the default Python 3.7.4 and the Python packages made available in the Anaconda 2019.10 release.

Assuming you are using .whl files, use the following command instead:

python -m pip install numpy

Not 100% sure if this will work for python 2.7

Installing applications and libraries with Conda – Advanced , We recommend, however, that you do not use the base environment but create and  Open the IDE and click to the "Sketch" menu and then Include Library > Manage Libraries. Then the Library Manager will open and you will find a list of libraries that are already installed or ready for installation. In this example we will install the Bridge library.

I tried the following and it works.

C:\Users\yashi>cd PycharmProjects\CSC411_A1\venv\Scripts

pip2 install numpy

But it raised another problem

Could not find a version that satisfies the requirement numpy (from versions: )
No matching distribution found for numpy

So I download the file numpy-1.15.2-cp27-none-win_amd64 and do

pip2 install numpy-1.15.2-cp27-none-win_amd64

Then it works.

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