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A collection of design patterns/idioms in Python
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Branch: master

Merge pull request #91 from mlyundin/master

Update of flyweight pattern
latest commit 1b898a5592
@faif authored
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.gitignore Remove __pycache__ and add __pycache__ to .gitignore
3-tier.py minor edit
README.md Implementing the registry pattern.
abstract_factory.py Pep8 check for abstract_factory.py
adapter.py minor edit
append_output.sh added the state variable to borg and improved the README
borg.py added the state variable to borg and improved the README
bridge.py Your code is too weak for PEP8. You lack DISCIPLINE
builder.py Your code is too weak for PEP8. You lack DISCIPLINE
catalog.py catalog: fix typo and use appropriate exception
chain.py change abstract_factory
chaining_method.py prefer python3 over 2
command.py remove some meanless line
composite.py Revert "edit the publish_subscribe.py"
decorator.py PEP8 changes
facade.py Your code is too weak for PEP8. You lack DISCIPLINE
factory_method.py Update factory_method.py
flyweight.py Update of flyweight pattern
front_controller.py minor edit
graph_search.py fix mistake usage of self param in recursive func and [] as default p…
iterator.py add __future__ print_function as print(number, end=' ') won't work in…
lazy_evaluation.py Add pattern: lazy_evaluation
mediator.py Your code is too weak for PEP8. You lack DISCIPLINE
memento.py Your code is too weak for PEP8. You lack DISCIPLINE
mvc.py Your code is too weak for PEP8. You lack DISCIPLINE
observer.py Minor pep8 changes. Most salient is that membership test should be 'x…
pool.py Your code is too weak for PEP8. You lack DISCIPLINE
prototype.py PEP8 changes
proxy.py fix typo
publish_subscribe.py Address PR comments
registry.py Implementing the registry pattern.
specification.py add output to the bottom of the specification.py and adaptation with …
state.py add __future__.print_function for better print
strategy.py fix indentation
template.py Add output to bottom of scripts
visitor.py Your code is too weak for PEP8. You lack DISCIPLINE

README.md

python-patterns

A collection of design patterns and idioms in Python.

When an implementation is added or modified, be sure to update this file and rerun append_output.sh (eg. ./append_output.sh borg.py) to keep the output comments at the bottom up to date.

Current Patterns:

Pattern Description
3-tier data<->business logic<->presentation separation (strict relationships)
abstract_factory use a generic function with specific factories
adapter adapt one interface to another using a whitelist
borg a singleton with shared-state among instances
bridge a client-provider middleman to soften interface changes
builder call many little discrete methods rather than having a huge number of constructor parameters
catalog general methods will call different specialized methods based on construction parameter
chain apply a chain of successive handlers to try and process the data
chaining_method continue callback next object method
command bundle a command and arguments to call later
composite encapsulate and provide access to a number of different objects
decorator wrap functionality with other functionality in order to affect outputs
facade use one class as an API to a number of others
factory_method delegate a specialized function/method to create instances
front_controller single handler requests coming to the application
flyweight transparently reuse existing instances of objects with similar/identical state
graph_search (graphing algorithms, not design patterns)
lazy_evaluation lazily-evaluated property pattern in Python
mediator an object that knows how to connect other objects and act as a proxy
memento generate an opaque token that can be used to go back to a previous state
mvc model<->view<->controller (non-strict relationships)
observer provide a callback for notification of events/changes to data
pool preinstantiate and maintain a group of instances of the same type
prototype use a factory and clones of a prototype for new instances (if instantiation is expensive)
proxy an object funnels operations to something else
publish_subscribe a source syndicates events/data to 0+ registered listeners
registry keeping track of all subclasses of a given class
specification business rules can be recombined by chaining the business rules together using boolean logic
state logic is org'd into a discrete number of potential states and the next state that can be transitioned to
strategy selectable operations over the same data
template an object imposes a structure but takes pluggable components
visitor invoke a callback for all items of a collection
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