subtasks is not ready yet. ## • ready() Return True if all of the subtasks are ready. ## • completed_count() Returns the number of completed subtasks. ## • revoke() Revokes all of the subtasks. ## • iterate() 'delivery_info': {'delivery_tag': 1, 'exchange': u'testexchange', 'message_count': 0, 'redelivered': False, 'routing_key': u'testkey'}, 'properties': ClickManager implements the increment_clicks method, which takes a URL and by how much to increment its count by. clickmuncher/models.py: from Django.db import models from Django.utils.translation import ugettext_lazy

C++20's constexper features can: • Generate data from code at compile-time • Be used to construct: ☐ Lookup Tables Configuration Fuses ☐ Compressed Strings USB Descriptors ## Along the way • Introduce const int bar = 1; int main() { foo += 1; // bar += 1; // ERROR } ## Building Resources • Lookup Tables • Configuration Fuses • Compressed String Tables • USB Descriptor Code samples available  Lookup Tables Lets make a lookup table that does linear interpolation. - Warning: constexpr is a gcc extension

subclass Writing a FileField subclass Custom Lookups A simple lookup example A simple transformer example Writing an efficient abs__lt lookup A bilateral transformer example Writing alternative implementations reference Model class reference Model Meta options Model instance reference QuerySet API reference Lookup API reference Query Expressions Conditional Expressions Database Functions Request and response types | Indexes | Meta options | Model class QuerySets: Making queries | QuerySet method reference | Lookup expressions Model instances: Instance methods | Accessing related objects Migrations: Introduction

select().where(user__in=editors) # how many active users are there? User.select().where(active=True).count() # paginate the user table and show me page 3 (users 41-60) User.select().order_by('username' annotate(Tweet).order_by('count', 'desc')) # another way of expressing the same User.select({ User: ['*'], Tweet: [Count('id', 'count')], }).group_by('id') group_by('id').join(Tweet).order_by('count', 'desc')) # do an atomic update TweetCount.update(count=F('count') + 1).where(user=charlie) You can use Django-style syntax to create select

subclass Writing a FileField subclass How to write custom lookups A lookup example A transformer example Writing an efficient abs__lt lookup A bilateral transformer example Writing alternative implementations reference Model class reference Model Meta options Model instance reference QuerySet API reference Lookup API reference Query Expressions Conditional Expressions Database Functions Paginator Paginator class types | Indexes | Meta options | Model class QuerySets: Making queries | QuerySet method reference | Lookup expressions Model instances: Instance methods | Accessing related objects Migrations: Introduction