If you are using windows then go to C: and search for python. A folder with user version number will be shown like ‘Python37’. Open the folder and you’ll see a folder named Scripts, open that, then you’ll find pip.exe. Now copy the folder path and open ‘Edit the system environment variables’ in control panel. In that click on Environmental Variables and you’ll something called path. Select path and click on edit, a window pops up, in that click and new and paste the directory address you copied previously. Save and exit everything. Now open cmd and type pip install [whatever].