Closed issues attached to a milestone with github3.py

ex.py

>>> import github3
>>> r = github3.repository(username, repo_name)
>>> milestones = list(r.milestones())
>>> milestone = None
>>> for m in milestones:
...    if m.name == desired_milestone_name:
...        milestone = m
...        break
...
>>> issues = list(r.issues(state='closed', milestone=milestone.number))