Try to run this command from the system terminal. Make sure that you use the correct version of 'pip' installed for your Python interpreter located at 'C:\Users\49162\PycharmProjects\Testproject\venv\Scripts\python.exe'. code example

Example 1: python install library in virtualenv

# ------- How to use a virtual environment on MAC? -------- #
# Use the command line to:

 1º - Instal Python3 and pip3
  
  
 2º - Create a folder for your virtual environment:
 
  >> cd "path_to_the_place_you_want_to_locate_your_folder"
  
  >> python3 -m venv "name_of_env"
  
  
 3º - Activate this virtual environment:

  >> source "name_of_env"/bin/activate
  
  
 4º - Now you can install new things inside this environment:
  
  >> pip3 install django  # for example

Example 2: pip install virtualenv windows

py -m pip install --user virtualenv