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Understanding Python decorators
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__
Comprendre la programmation fonctionnelle, Blend Web Mix le 02/11/2016
Vous commencez à en entendre parler de plus en plus mais vous avez encore du mal à voir ce que c’est et à comprendre de que ça change concrètement, ce talk est fait pour vous !!!
La programmation fonctionnelle est une manière de programmer basée sur les fonctions qui permet de faire du code vraiment modulaire, améliorer la qualité et limiter les bugs. Vous ne me croyez pas ? Venez voir cette session !
Recommended
Understanding Python decorators
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__
Comprendre la programmation fonctionnelle, Blend Web Mix le 02/11/2016
Vous commencez à en entendre parler de plus en plus mais vous avez encore du mal à voir ce que c’est et à comprendre de que ça change concrètement, ce talk est fait pour vous !!!
La programmation fonctionnelle est une manière de programmer basée sur les fonctions qui permet de faire du code vraiment modulaire, améliorer la qualité et limiter les bugs. Vous ne me croyez pas ? Venez voir cette session !
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- 6. var arr_var = []
- 7. array_var[0]
- 9. push (el) & unshift (el) & shift (el) & pop (el) slice (i, count, els) & splice (i, count, els) & join(separator) & reverse()
- 10. FUNCTION
- 11. function fnc_name() { // function body }
- 12. var fnc_var = function() { // function body }
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- 16. function fnc_name( par1, .. , parN ) { // function body } Parameters
- 17. function fnc_name( par1, .. , parN ) { } Parameters arguments
- 19. function fnc_name( par1, .. , parN ) { return “Some result”; } side efects
- 21. function fnc_name( par1, .. , parN ) { var inner_var = 5; } console.log(inner_var) // undefined
Editor's Notes
- typeof (variable)
- typeof (variable)