Package: bitmapist
NEW!Try out our new standalonebitmapist-server, which improves memory efficiency 443 times and makes your setup much cheaper to run (and more scaleable). It's fully compatiable with bitmapist that runs on Redis.bitmapist: a powerful analytics library for RedisThis Python library makes it possible to implement real-time, highly scalable analytics that can answer following questions:Has user 123 been online today? This week? This month?Has user 123 performed action "X"?How many users have been active this month? This hour?How many unique users have performed action "X" this week?How many % of users that were active last week are still active?How many % of users that were active last month are still active this month?What users performed action "X"?This library is very easy to use and enables you to create your own reports easily.Using Redis bitmaps you can store events for millions of users in a very little amount of memory (megabytes).
You should be careful about using huge ids as this could require larger amounts of memory. Ids should be in range [0, 2^32).Additionally bitmapist can generate cohort graphs that can do following:Cohort over user retentionHow many % of users that were active last [days, weeks, months] are still active?How many % of users that performed action X also performed action Y (and this over time)And a lot of other things!If you want to read more about bitmaps please read following:http://blog.getspool.com/2011/11/29/fast-easy-realtime-metrics-using-redis-bitmaps/http://redis.io/commands/setbithttp://en.wikipedia.org/wiki/Bit_arrayhttp://www.slideshare.net/crashlytics/crashlytics-on-redis-analyticsInstallationCan be installed very easily via:$ pip install bitmapistPortsPHP port:https://github.com/jeremyFreeAgent/BitterExamplesSetting things up:fromdatetimeimportdatetime,timedeltafrombitmapistimportsetup_redis,delete_all_events,mark_event,\MonthEvents,WeekEvents,DayEvents,HourEvents,\BitOpAnd,BitOpOrnow=datetime.utcnow()last_month=datetime.utcnow()-timedelta(days=30)Mark user 123 as active and has played a song:mark_event('active',123)mark_event('song:played',123)Answer if user 123 has been active this month:assert123inMonthEvents('active',now.year,now.month)assert123inMonthEvents('song:played',now.year,now.month)assertMonthEvents('active',now.year,now.month).has_events_marked()==TrueHow many users have been active this week?:print(len(WeekEvents('active',now.year,now.isocalendar()[1])))Iterate over all users active this week:foruidinWeekEvents('active'):print(uid)If you're interested in "current events", you can omit extranow.whateverarguments. Events will be populated with current time automatically.For example, these two calls are equivalent:MonthEvents('active')==MonthEvents('active',now.year,now.month)Additionally, for the sake of uniformity, you can create an event from
any datetime object with afrom_datestatic method.MonthEvents('active').from_date(now)==MonthEvents('active',now.year,now.month)Get the list of these users (user ids):print(list(WeekEvents('active',now.year,now.isocalendar()[1])))There are special methodsprevandnextreturning "sibling" events and
allowing you to walk through events in time without any sophisticated
iterators. Adeltamethod allows you to "jump" forward or backward for
more than one step. Uniform API allows you to use all types of base events
(from hour to year) with the same code.current_month=MonthEvents()prev_month=current_month.prev()next_month=current_month.next()year_ago=current_month.delta(-12)Every event object hasperiod_startandperiod_endmethods to find a
time span of the event. This can be useful for caching values when the caching
of "events in future" is not desirable:ev=MonthEvent('active',dt)ifev.period_end()<now:cache.set('active_users_<...>',len(ev))As something new tracking hourly is disabled (to save memory!) To enable it as default do::importbitmapistbitmapist.TRACK_HOURLY=TrueAdditionally you can supply an extra argument tomark_eventto bypass the default value::mark_event('active',123,track_hourly=False)Unique eventsSometimes the date of the event makes little or no sense, for example,
to filter out your premium accounts, or in A/B testing. There is aUniqueEventsmodel for this purpose. The model creates only one
Redis key and doesn't depend on the date.You can combine unique events with other types of events.A/B testing example:active_today=DailyEvents('active')a=UniqueEvents('signup_form:classic')b=UniqueEvents('signup_form:new')print("Active users, signed up with classic form",len(active&a))print("Active users, signed up with new form",len(active&b))Generic filter exampledefpremium_up(uid):# called when user promoted to premium...mark_unique('premium',uid)defpremium_down(uid):# called when user loses the premium status...unmark_unique('premium',uid)active_today=DailyEvents('active')premium=UniqueEvents('premium')# Add extra Karma for all premium users active today,# just because today is a special dayforuidinpremium&active_today:add_extra_karma(uid)To get the best of two worlds you can mark unique event and regular
bitmapist events at the same time.defpremium_up(uid):# called when user promoted to premium...mark_event('premium',uid,track_unique=True)Perform bit operationsHow many users that have been active last month are still active this month?active_2_months=BitOpAnd(MonthEvents('active',last_month.year,last_month.month),MonthEvents('active',now.year,now.month))print(len(active_2_months))# Is 123 active for 2 months?assert123inactive_2_monthsAlternatively, you can use standard Python syntax for bitwise operations.last_month_event=MonthEvents('active',last_month.year,last_month.month)this_month_event=MonthEvents('active',now.year,now.month)active_two_months=last_month_event&this_month_eventOperators&,|,^and~supported.Work with nested bit operations (imagine what you can do with this ;-))!active_2_months=BitOpAnd(BitOpAnd(MonthEvents('active',last_month.year,last_month.month),MonthEvents('active',now.year,now.month)),MonthEvents('active',now.year,now.month))print(len(active_2_months))assert123inactive_2_months# Delete the temporary AND operationactive_2_months.delete()DeletingIf you want to permanently remove marked events for any time period you can use thedelete()method:last_month_event=MonthEvents('active',last_month.year,last_month.month)last_month_event.delete()If you want to remove all bitmapist events use:bitmapist.delete_all_events()When using Bit Operations (ieBitOpAnd) you can (and probably should) delete the results unless you want them cached. There are different ways to go about this:active_2_months=BitOpAnd(MonthEvents('active',last_month.year,last_month.month),MonthEvents('active',now.year,now.month))# Delete the temporary AND operationactive_2_months.delete()# delete all bit operations created in runtime up to this pointbitmapist.delete_runtime_bitop_keys()# delete all bit operations (slow if you have many millions of keys in Redis)bitmapist.delete_temporary_bitop_keys()bitmapist cohortWith bitmapist cohort you can get a form and a table rendering of the data you keep in bitmapist. If this sounds confusingplease look at Mixpanel.Here's a simple example of how to generate a form and a rendering of the data you have inside bitmapist:frombitmapistimportcohorthtml_form=cohort.render_html_form(action_url='/_Cohort',selections1=[('Are Active','user:active'),],selections2=[('Task completed','task:complete'),])print(html_form)dates_data=cohort.get_dates_data(select1='user:active',select2='task:complete',time_group='days')html_data=cohort.render_html_data(dates_data,time_group='days')print(html_data)# All the arguments should come from the FORM element (html_form)# but to make things more clear I have filled them in directlyThis will render something similar to this:ContributingPlease see our guidehereLocal DevelopmentWe use Poetry for dependency management & packaging.  Please seehere for setup instructions.Once you have Poetry installed, you can run the following to install the dependencies in a virtual environment:poetryinstallTestingTo run our tests will need to ensure a local redis server is installed.We use pytest to run unittests which you can run in a poetry shell withpoetryrunpytestReleasing new versionsBump version inpyproject.tomlUpdate the CHANGELOGCommit the changes with a commit message "Version X.X.X"Tag the current commit withvX.X.XCreate a new release on GitHub namedvX.X.XGitHub Actions will publish the new version to PIP for youLegalCopyright: 2012 by Doist Ltd.License: BSD