Библиотека Python разработчика | Книги по питону
Погружение в CPython и архитектуру. Разбираем неочевидное поведение (GIL, Memory), Best Practices (SOLID, DDD) и тонкости Django/FastAPI. Решаем задачи с подвохом и оптимизируем алгоритмы. 🐍 По всем вопросам @evgenycarter РКН clck.ru/3Ko7Hq
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По всем вопросам @evgenycarter
РКН clck.ru/3Ko7Hq”
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obj.x is a call of the x method. In Java, it's recommended to make all attributes private and write trivial getters instead: public int getX() { return this.x }.
Python offers a solution that is somehow similar to that that Ruby has. You can define property so obj.x invokes a method instead of returning the x attribute directly.
class Example:
def __init__(self, x):
self._x = x
@property
def x(self):
return self._xarray = [1, 2, 3, 4, 5, 6, 7, 8, 9]
print(array[::2])
# Вывод : [1, 3, 5, 7, 9]
Подписывайтесь на канал 👉@pythonofffclass GrandParent:
pass
class Parent1(GrandParent):
pass
class Parent2(GrandParent):
pass
class Child(Parent1, Parent2):
pass
Which order will be used to look up the Child.x() method? The naive approach is to recursively search through all parent classes which gives us Child, Parent1, GrandParent, Parent2. While many programming languages follow this method indeed, it doesn't quite make sense, because Parent2 is more specific than GrandParent and should be looked up first.
In order to fix that problem, Python uses C3 superclass linearization, the algorithm that always searches for a method in all child classes before looking up the parent one:
In : Child.__mro__
Out:
(__main__.Child,
__main__.Parent1,
__main__.Parent2,
__main__.GrandParent,
object)for and with can be asynchronous. async with uses __aenter__ and __aexit__ magic methods, async for uses __aiter__ and __anext__. All of them are async and you can await within them:
import asyncio
class Sleep:
def __init__(self, t):
self._t = t
async def __aenter__(self):
await asyncio.sleep(self._t / 2)
async def __aexit__(self, *args):
await asyncio.sleep(self._t / 2)
async def main():
async with Sleep(2):
print('*')
loop = asyncio.get_event_loop()
loop.run_until_complete(main())
When you implement __iter__ you often don't write an iterator with __next__ method, you just use yield that makes __iter__ a generator:
class Bracketed:
def __init__(self, data):
self._data = data
def __iter__(self):
for x in self._data:
yield '({})'.format(x)
print(list(Bracketed([1, 2, 3])))
# ['(1)', '(2)', '(3)']
PEP 525 allows you do the same with __aiter__. Both yield and await in the function body make it asynchronous generator. While await is used to communicate with the loop, yield deals with for:
import asyncio
class Slow:
def __init__(self, data, t=1):
self._data = data
self._t = t
async def __aiter__(self):
for x in self._data:
await asyncio.sleep(self._t)
yield x
async def main():
async for x in Slow([1, 2, 3]):
print(x)
loop = asyncio.get_event_loop()
loop.run_until_complete(main())
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