国外技术干货：GDD_pydp_python_design_patterns

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2025-03-28 0 0 4.18MB 46 页 5.9玖币

侵权投诉

Design Patterns in Python

Alex Martelli (aleax@google.com)

http://www.aleax.it/gdd_pydp.pdf

The "levels" of this talk

Shu

("Retain")

("Detach")

("Transcend")

Hit the ground running...

"Forces": some rich,

complex subsystem

offers a lot of useful

functionality; client

code interacts with

several parts of this

functionality in a way

that's "out of control"

this causes many

problems for client-code

programmers AND

subsystem ones too

(complexity + rigidity)

Solution: the "Facade" DP

interpose a simpler

"Facade" object/class

exposing a controlled

subset of functionality

client code now calls

into the Facade, only

the Facade implements

its simpler functionality

via calls into the rich,

complex subsystem

subsystem implementation

gains ﬂexibility

, clients gain simplicity

DP "Facade"

!existing supplier code ! provides rich,

complex functionality in protocol S

!we need a simpler "subset" C of S

!facade code " implements and supplies C

(by calling S on !)

Facade is a Design Pattern

summary of a frequent design problem +

structure of a solution to that problem (+

pros and cons, alternatives, ...), and:

A NAME (much easier to retain/discuss!)

"descriptions of communicating objects and

classes customized to solve a general design

problem in a particular context"

that's NOT: a data structure, algorithm,

domain-speciﬁc system architecture,

programming-language/library feature

MUST be studied in a language's context!

MUST supply Known Uses ("KU")

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摘要：

Copyright©2007,GoogleIncDesignPatternsinPythonAlexMartelli(aleax@google.com)http://www.aleax.it/gdd_pydp.pdfThe"levels"ofthistalk2ShuHaRiPyDP("Retain")("Detach")("Transcend")Hitthegroundrunning...3"Forces":somerich,complexsubsystemoffersalotofusefulfunctionality;clientcodeinteractswithseveralpartsof...

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国外技术干货：GDD_pydp_python_design_patterns

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