The command "pip install pyautogui" represents python module called "pyautogui" installation. The module is installed into the python site packages folder present in /usr/localfolder(username/share/python3.x/site-packages/...). The installation requires specific requirements in the environment.
The python path variable should be set to bin folder in python and pip commands should be executable from various paths of the terminal window.
Useually there could be reasons similar to configuration issues with modules of different python packages. If there is any specific version cause installation and configuration issues with respect to pip one of the command could be useful is to upgrade the pip command.
"pip install --upgrade pip ------> The command upgrades pip version to latest.
If the module is unable to pickup by the terminal of mac/linux os the module .zip or .tar files can be downloaded from the websites of python language.
Based on the version of the python 3.x most of the existing python modules built earlier became obsolete and needs to be depricated from site-packages. Always, make sure the package is valid and check the status prior to installation for avoiding unnecessary installations.
If the Operating system is macbook. The installation should be run on terminal window. The same installation can be triggered on CMD in windows OS and for linux/Unix execute .sh files from the environment shell prompt depending on shell . choose one of the two based on your requirement.