In addition to the answer by @mocha, here is an alternative way,
which avoids opening the shell if you prefer to stay in Jupyter.
Open a Jupyter document in the Jupyter notebook, type the following
in a code cell, and execute that cell:
!pip install admcycles --user
Explanation: the initial ! is to run a shell command from
inside a Jupyter document.
If that Jupyter document is using the Sage kernel, then the pip
command runs Sage's pip; you don't need to type sage -pip.
In fact this is also the case in the Sage-Windows "Sage shell",
you could type
pip install admcycles --user
with just pip instead of sage -pip.
Optionally, add --upgrade to the command:
!pip install admcycles --user --upgrade
(with initial ! if you type this in Jupyter, or without it
if you type this in the shell).
The extra --upgrade is useful in case you already have a version
of admcycles installed, older than the latest released version.
In that case, without --upgrade, pip finds that some version of
admcycles is already installed and stops there, so the old version
stays installed; while with --upgrade, pip uninstalls the old
version and installs the new one.
