= Membership Model Visualization =

The newly proposed PSF membership model is a great idea and the
echo from the PSF members is overwhelmingly positive.

There are quite a few details. A picture may help to make these easier
to understand. This is an attempt to visualize this. Instead of using a
graphics drawing application, I generated the diagram below with a Python
program. The source is also attached.

  So, just where does "the diagram below" appear? - SH

This is by no means complete but can serve as a basis for coming up with
further details. The advantage is that all these familiar tools and
procedures such as version control, pull request and tests can be
applied.

So far there is no code in methods. It should be possible to
add algorithms and make the membership rules executable. Since code
is primarily a means of communication between humans and only in the
second place instructions for the computer, this little program
may help to better understand what we want to express.

 {{attachment:classes_membership_model.png||align="middle"}}


{{{#!highlight python

#! /usr/bin/env python3

"""The new PSF membership model in code.
"""

import abc


class Member(metaclass=abc.ABCMeta):
    """A member of the PSF. An abstract concept.
    """


class IndividualMember(Member):
    """A personal member.

    Anyone how would to be associated with the PSF can sign up.
    """
    order_of_magnitude_range = 1e4, 1e5


class InstitutionalMember(Member, metaclass=abc.ABCMeta):
    """An institutional member of the PSF. An abstract concept.
    """

    def vote(self):
        """Elect board members.
        """


class SponsorMember(InstitutionalMember):
    """Organization that pays to be a member.

    These can be companies or other institutions.
    """
    order_of_magnitude_range = 1e1, 1e3


class OrganizationMember(InstitutionalMember):
    """National organizations that are somewhat equivalent to
    the PSF, but operate in other countries.

    These organizations should have or work comparable to having a non-profit
    status.
    """
    order_of_magnitude_range = 1e1, 1e2


class VotingMember(IndividualMember, metaclass=abc.ABCMeta):
    """An individual member with voting rights.
    """

    def vote(self):
        """Elect board members.
        """


class SupportingMember(VotingMember):
    """A member who gives money.
    """
    order_of_magnitude_range = 1e1, 1e3


class ManagingMember(VotingMember):
    """A member who gives time.
    """
    order_of_magnitude_range = 1e1, 1e2


class ContributingMember(VotingMember):
    """A member who gives code, documentation etc.
    """
    order_of_magnitude_range = 1e1, 1e2


class Fellow(ManagingMember, ContributingMember):
    # No sequence of parents intended but need to specify one.
    """Elected from among the members.
    """
    order_of_magnitude_range = 1e1, 1e2


class BoardMember(Fellow):
    # No sequence of parents intended but need to specify one.
    """Elected from among the fellows.
    """
    order_of_magnitude_range = 1e0, 1e1


class WorkingGroup:
    """A working group.
    """
    """
}}}