When "Python" installs both Python2 and Python3, how does the pip command work?

When Python2 and Python3 are installed on Windows at the same time, their corresponding Pip is called Pip.exe, so it is not possible to install the package directly using the PIP Install command. Instead, you use the initiator Py.exe to specify the version of the PIP. The command is as follows: Py-2-m PIP install xxxx #-2 means that the PIP module is run with python2,-m Pip, that is, the PIP command is running. If you are installing software for Python3, then the command is similar to py-3-m pip install xxxx

When "Python" installs both Python2 and Python3, how does the pip command work?