pip is the Python package manager, which comes installed by default in just about every Python distribution except Cygwin.
conda: Python packages, R packages and compilers
twine: Python packages from PyPi, a more modern Python package manager
from Windows Command Prompt:
setup-x86_64 -P python3-pip python3-devel gcc-g++ gcc-fortran
not some Windows path you might have for Anaconda Python.
For example, to install package
simplekml that enables
Pythonic KML writing:
python3 -m pip install simplekml