activate python virtualenv in cmd
venv\Scripts\activate
how to install a package in virtualenv python
### install library `virtualenv`
$ pip3 install virtualenv
### call module `venv` with the name for your environment
$ python3 -m venv venv_name
### activate the created environment
$ source venv_name/bin/activate #key step
### install the packages
(venv_name) user@host: pip3 install "package-name"
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