summary: use calendar.monthrange instead of internal calendar.mday Fix pytype warning: No attribute 'mdays' on module 'calendar' [module-attr] This also takes care of handling leap-years correctly. Not that it matters, but very nice ...

# requirements.txt file for use as "pip install -r requirements.txt" as a
# readthedocs compatible alternative to "pip install -e ." which is a working
# alternative to "setup.py develop" which doesn't work with Mercurial 3.7
.