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Korištenje dekoratora je jednostavno, no pisanje zna biti kompleksno. • Kroz jednostavne korake ćemo proći i naučiti dekoratore 1. Funkcije Kreiranje def, parametri, vraćanje vrijednosti, poziv funkcije def foo(): return 1 print foo() 1 2. Scope Namespace funkcije za identificiranje varijabli u tijelu funkcije a_string = "This is a global variable" def foo(): print a_string # 1 foo() This is a global variable 3. variable resolution rules Pristup globalnim varijablama (promjenjiv tip podataka podržava promjene) a = ["Pero"] b = "Pero” def foo(): a[0] = "Ivo” b = "Ivo" print locals() foo() print globals() print a 4. Variable lifetime Namespace je svaki puta kreiran i uništen prilikom poziva funkcije, ne postoji sintaksa za vrijednost varijable. def foo(): x = 1 foo() 5. Function arguments and parameters Parametri funkcije mogu biti nazivi ili pozicije def foo(x, y=0): return x - y print foo(3,1) print foo(3) 6. Nested function Python gleda scope outer prvo i pronalazi lokalnu varijablu kroz inner def outer(): x = 1 def inner(): print x inner() outer() 7. Functions are first class objects in Python Funkcije su objekti u Pythonu, (klase su također objekti), shvaćamo ih kao vrijednosti, te ih možemo koristiti npr. kao argumente. print issubclass(int, object) def foo(): pass print foo.__class__ print issubclass(foo.__class__, object) 8. Closures Inner funkcija definirana u ne globalnom scope pamti izgled namespace. def outer(): x = 1 def inner(): print x return inner foo = outer() foo() 9. Decorators def outer(some_func): def inner(): print "Before some_func" ret = some_func() print some_func.__name__ return ret + 1 return inner def foo(): return 1 decorated = outer(foo) print decorated() 10. Symbol @ applies a decorator def outer(some_func): def inner(): print "Before some_func" ret = some_func() print some_func.__name__ return ret + 1 return inner @outer def foo(): return 1 print foo() 11. *args and **kwargs def logger(func): def inner(*args, **kwargs): print "Argumenti su bili : %s, %s" %(args, kwargs) return func(*args, **kwargs) return inner @logger def fool(x,y=1): return x * y @logger def fool2(): return 2 print fool(5,2) print fool2() 12. functools.wraps from functools import wraps def logged(func): @wraps(func) def with_logging(*args, **kwargs): print func.__name__ + " was called" return func(*args, **kwargs) return with_logging @logged def f(x): """does some math""" return x + x * x print f(3) print f.__name__
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Korištenje dekoratora je jednostavno, no pisanje zna biti kompleksno. • Kroz jednostavne korake ćemo proći i naučiti dekoratore 1. Funkcije Kreiranje def, parametri, vraćanje vrijednosti, poziv funkcije def foo(): return 1 print foo() 1 2. Scope Namespace funkcije za identificiranje varijabli u tijelu funkcije a_string = "This is a global variable" def foo(): print a_string # 1 foo() This is a global variable 3. variable resolution rules Pristup globalnim varijablama (promjenjiv tip podataka podržava promjene) a = ["Pero"] b = "Pero” def foo(): a[0] = "Ivo” b = "Ivo" print locals() foo() print globals() print a 4. Variable lifetime Namespace je svaki puta kreiran i uništen prilikom poziva funkcije, ne postoji sintaksa za vrijednost varijable. def foo(): x = 1 foo() 5. Function arguments and parameters Parametri funkcije mogu biti nazivi ili pozicije def foo(x, y=0): return x - y print foo(3,1) print foo(3) 6. Nested function Python gleda scope outer prvo i pronalazi lokalnu varijablu kroz inner def outer(): x = 1 def inner(): print x inner() outer() 7. Functions are first class objects in Python Funkcije su objekti u Pythonu, (klase su također objekti), shvaćamo ih kao vrijednosti, te ih možemo koristiti npr. kao argumente. print issubclass(int, object) def foo(): pass print foo.__class__ print issubclass(foo.__class__, object) 8. Closures Inner funkcija definirana u ne globalnom scope pamti izgled namespace. def outer(): x = 1 def inner(): print x return inner foo = outer() foo() 9. Decorators def outer(some_func): def inner(): print "Before some_func" ret = some_func() print some_func.__name__ return ret + 1 return inner def foo(): return 1 decorated = outer(foo) print decorated() 10. Symbol @ applies a decorator def outer(some_func): def inner(): print "Before some_func" ret = some_func() print some_func.__name__ return ret + 1 return inner @outer def foo(): return 1 print foo() 11. *args and **kwargs def logger(func): def inner(*args, **kwargs): print "Argumenti su bili : %s, %s" %(args, kwargs) return func(*args, **kwargs) return inner @logger def fool(x,y=1): return x * y @logger def fool2(): return 2 print fool(5,2) print fool2() 12. functools.wraps from functools import wraps def logged(func): @wraps(func) def with_logging(*args, **kwargs): print func.__name__ + " was called" return func(*args, **kwargs) return with_logging @logged def f(x): """does some math""" return x + x * x print f(3) print f.__name__
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สรุปงานผู้ทดสอบ
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