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Python Decorators
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Eloy Zuniga Jr.
June 19, 2012
Technology
8
630
Python Decorators
A basic understanding of Python Decorators.
Eloy Zuniga Jr.
June 19, 2012
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Transcript
Decorators What are they? How to explain them. Tuesday, June
19, 12
Tuesday, June 19, 12
Basic definition Decorator is a function that takes a function
as a parameter and returns a function Tuesday, June 19, 12
Basic definition Decorator is a function that takes a function
as a parameter and returns a function Is a function. Takes a function. Returns a function Tuesday, June 19, 12
func = func_hugger(func) Illustration Tuesday, June 19, 12
def in_bed(func): def f(): return ‘%s In bed.’ % func()
return f Change output Tuesday, June 19, 12
def in_bed(func): def f(): if f.in_pool: return ‘%s In pool.’
% func() return ‘%s In bed.’ % func() f.in_pool = False return f Add attributes Tuesday, June 19, 12
def in_bed(func): def f(*args, **kwargs): if args or kwargs: raise
Exception(‘wat?’) return ‘%s In bed.’ % func() return f Validate Tuesday, June 19, 12
Tuesday, June 19, 12
Basic definition Is a function. Takes a function. Returns a
function Tuesday, June 19, 12
Syntactic Sugar Annotation Syntax Tuesday, June 19, 12
Syntactic Sugar Annotation Syntax @func Tuesday, June 19, 12
def luke_quote(): return “I’m Luke SkyWalker, I’m here to rescue
you.” Decorate Tuesday, June 19, 12
def luke_quote(): return “I’m Luke SkyWalker, I’m here to rescue
you.” Decorate @in_bed Tuesday, June 19, 12
def luke_quote(): return “I’m Luke SkyWalker, I’m here to rescue
you.” Decorate @in_bed @no_inbreeding Tuesday, June 19, 12
def luke_quote(): return “I’m Luke SkyWalker, I’m here to rescue
you.” Decorate @in_bed(with=”lightsaber”) @in_bed Tuesday, June 19, 12
Tuesday, June 19, 12
@eloy Tuesday, June 19, 12