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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>>> print = 42
>>> print(42)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'int' object is not callable
That may be helpful if your module defines some functions that have the same name as built-in ones. That also happens if you practice metaprogramming and you accept an arbitrary string as an identifier.
However, even if you shadow some built-in names, you still may want to have access to things they initially referred to. The builtins module exists exactly for that:
>>> import builtins
>>> print = 42
>>> builtins.print(1)
1
The __builtins__ variable is also available in most modules. There is a catch though. First, this is a cpython implementation detail and usually should not be used at all. Second, __builtins__ might refer to either builtins or builtins.__dict__, depending on how exactly the current module was loaded.sys.builtin_module_names to get the full list of such modules. The notable examples are sys, gc, time and so on.
Usually you don't care whether the module is built-in or not; however, you should be aware, that import always looks for a module among built-ins first. So, the built-in sys module is loaded even if you have sys.py available. On the other hand, if you have, say, datetime.py in the current directory it indeed can be loaded instead of the standard datetime module.__hash__ method that returns an integer value. To get a hash of the value, the hash built-in function is used.
Built-in types that are not mutable are hashable by default. All custom objects are also hashable, but there is a catch. If you define __eq__ method for your custom type, then you should define such __hash__ that hash(a) == hash(b) for every a and b that are equal. Violating this rule may result in dictionary malfunctioning:
class A:
def __init__(self, x):
self.x = x
def __hash__(self):
return random.randrange(10000)
def __eq__(self, other):
return self.x == other.x
In : d = {}
In : d[A(2)] = 2
In : d.get(A(2), 0)
Out: 0
Mind that though once you define __eq__ in the class, the default __hash__ method is removed since the default implementation is no longer suitable (with it all values are unequal).PEP 8 is a famous style guide for Python code. It's not enforced by the interpreter but you are highly discouraged to ignore it.
There is a tool to automatically check whether your code is following PEP 8 recommendations. Its former name is pep8, but it was renamed to pycodestyle at the request of Guido. Now you should use pycodestyle installed with pip intall pycodestyle only.
You can check whether pycodestyle is happy with your project like this:
$ pycodestyle . -qq --statistics
1 E302 expected 2 blank lines, found 1
1 E305 expected 2 blank lines after class
or function definition, found 1
20 E501 line too long (83 > 79 characters)multiprocessing.Pool is for you. It spawns multiple processes and delegates tasks to them automatically. Simply create a pool with Pool(number_of_processes) and run p.map with the list of inputs.
In : import math
In : from multiprocessing import Pool
In : inputs = [i ** 2 for i in range(100, 130)]
In : def f(x):
...: return len(str(math.factorial(x)))
...:
In : %timeit [f(x) for x in inputs]
1.44 s ± 19.2 ms per loop (...)
In : p = Pool(4)
In : %timeit p.map(f, inputs)
451 ms ± 34 ms per loop (...)
You can also omit the number_of_processes parameter, the default value for it is the number of CPU cores on the current system.1, 2, 3. OK, so far, so good. What about tuple containing only one element? You just add trailing comma to the only value: 1,. Well, that’s somewhat ugly and error prone, but makes sense.
What about empty tuple? Is it a bare ,? No, it’s (). Do parentheses create tuple as well as commas? No, they don’t, (4) is not a tuple, it’s just 4.
In : a = [
...: (1, 2, 3),
...: (1, 2),
...: (1),
...: (),
...: ]
In : [type(x) for x in a]
Out: [tuple, tuple, int, tuple]
To make things more obscure, tuple literals often require additional parentheses. If you want a tuple to be the only argument of a function, that f(1, 2, 3) doesn’t work for an obvious reason, you need f((1, 2, 3)) instead.if, bool, not etc.
False objects are None, False, 0 of any type, and empty collections: "", [], {} etc., including custom collections with the __len__ method as long as __len__ returns 0.
You can also define custom truth value testing for your objects, the __bool__ magic method is there for this:
class Rectangle:
def __init__(self, width, height):
self._w = width
self._h = height
def __bool__(self):
return bool(self._w and self._h)
In : bool(Rectangle(2, 3))
Out: True
In : bool(Rectangle(2, 0))
Out: False
In : bool(Rectangle(0, 2))
Out: False
Mind, that __bool__ is called __nonzero__ in Python 2.__getitem__ method:
In : class Iterable:
...: def __getitem__(self, i):
...: if i > 10:
...: raise IndexError
...: return i
...:
In : list(Iterable())
Out: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
The second way is to define __iter__ method that returns an iterator. An iterator is an object with a __next__ method that returns next value from the original iterable once called:
In : class Iterator:
...: def __init__(self):
...: self._i = 0
...:
...: def __next__(self):
...: i = self._i
...: if i > 10:
...: raise StopIteration
...: self._i += 1
...: return i
...:
...: class Iterable:
...: def __iter__(self):
...: return Iterator()
...:
...:
In : list(Iterable())
Out: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
Usually, an iterator also has an __iter__ method that just returns self: it allows iterator to be iterated too, that means that most of the iterators are also iterables.