Answers for "python use pip"

pip install python

## To install Pip, first download get-pip.py from:
https://bootstrap.pypa.io/get-pip.py
  
## Then run the following command in the command line
## in the folder where the file has been saved.
python get-pip.py

pip install python 3

You cannot just pip install python3 because it is not a library.

If you want to install the latest python3:
https://www.python.org/ftp/python/3.8.2/python-3.8.2.exe

install pip

python -m pip download [options] <requirement specifier> [package-index-options] ...
python -m pip download [options] -r <requirements file> [package-index-options] ...
python -m pip download [options] <vcs project url> ...
python -m pip download [options] <local project path> ...
python -m pip download [options] <archive url/path> ...