小编gol*_*ode的帖子

考虑以下代码：

import functools
import inspect

class Foo:
    def foo_fn(self, hello, world):
        print(hello, world)

class FooWrapper:
    def __init__(self, foo_class):
        self._foo = foo_class()
        for key, value in inspect.getmembers(self._foo):
            if inspect.ismethod(value):
                bound_fn = functools.partial(self.foo_wrapper_fn, self, value)
                setattr(self._foo, key, bound_fn)

    def foo_wrapper_fn(self_wrapper, self_foo, bound_method, hello, world):
        bound_method(hello, world)

def make_foo(Foo):
    wrapper = FooWrapper(Foo)
    return wrapper._foo
a = make_foo(Foo)
a.foo_fn("hello", "world")

1. foo_wrapper_fn()像这样的功能参数如何排序(self_wrapper, self_foo, bound_method, hello, world)？而不是这样：self_wrapper, bound_fn, self_foo, hello, world，由于self_wrapper和bound_fn首先被部分绑定？

2. 对象（）调用返回functool.partial （而不是functool.partialmethod）可以 …

我正在研究零度规则,并且对最终的一段代码有两个问题,这些代码证明了规则.

class module {
    public:
        explicit module(std::wstring const& name)
        : handle { ::LoadLibrary(name.c_str()), &::FreeLibrary } {}

        // other module related functions go here

    private:
        using module_handle = std::unique_ptr<void, decltype(&::FreeLibrary)>;

        module_handle handle;
    };

1. 为什么要使用大括号而不是括号来初始化句柄？
2. 使用module_handle = std :: unique_ptr是什么用的; 在这种情况下是什么意思？是否可以用typedef替换它？

考虑下面的代码。逗号分隔时，Python如何解释类​​RottenFruit？这合法吗？如果是，用例是什么？

from enum import Enum
class Fruit(Enum):
     Apple = 4
     Orange = 5
     Pear = 6 
a = Fruit(5)

class RottenFruit(Enum):
     Apple = 4,
     Orange = 5,
     Pear = 6
print(Fruit(5))
print(RottenFruit(5))

输出：

Fruit.Orange
Traceback (most recent call last):
  File "...\tests\sandbox.py", line 15, in <module>
    print(RottenFruit(5))
  File "...\AppData\Local\Programs\Python\Python36\lib\enum.py", line 291, in __call__
    return cls.__new__(cls, value)
  File "...\AppData\Local\Programs\Python\Python36\lib\enum.py", line 533, in __new__
    return cls._missing_(value)
  File "...\AppData\Local\Programs\Python\Python36\lib\enum.py", line 546, in _missing_
    raise ValueError("%r is not a valid %s" % (value, cls.__name__))
ValueError: …