weekly - weekly-2020-11-0x01 - 《hackettyu.com》

title: Weekly 2020-11-0x01description: [hackettyu’weekly]
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title: Weekly 2020-11-0x01description: [hackettyu’weekly]

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Python

https://docs.python.org/3/library/typing.html

NewType
利用 NewType 可以定义一个新的检查类型

from typing import NewType
UserId = NewType('UserId', int)
some_id = UserId(524313)

Callable type
Callable[[int], str] is a function of (int) -> str.
Optional type
You can use Optional[X] as a shorthand for Union[X, None].
Literal type
A type that can be used to indicate to type checkers that the corresponding variable or function parameter has a value equivalent to the provided literal (or one of several literals). For example:

def validate_simple(data: Any) -> Literal[True]:  # always returns True
    ...

MODE = Literal['r', 'rb', 'w', 'wb']
def open_helper(file: str, mode: MODE) -> str:
    ...

open_helper('/some/path', 'r')  # Passes type check
open_helper('/other/path', 'typo')  # Error in type checker

Final type
A special typing construct to indicate to type checkers that a name cannot be re-assigned or overridden in a subclass. For example:

MAX_SIZE: Final = 9000
MAX_SIZE += 1  # Error reported by type checker

class Connection:
    TIMEOUT: Final[int] = 10

class FastConnector(Connection):
    TIMEOUT = 1  # Error reported by type checker

Constant type
TYPE_CHECKING type
A special constant that is assumed to be True by 3rd party static type checkers. It is False at runtime. Usage:

if TYPE_CHECKING:
    import expensive_mod

def fun(arg: 'expensive_mod.SomeType') -> None:
    local_var: expensive_mod.AnotherType = other_fun()
The first type annotation must be enclosed in quotes, making it a “forward reference”, to hide the expensive_mod reference from the interpreter runtime. Type annotations for local variables are not evaluated, so the second annotation does not need to be enclosed in quotes.

软件设计哲学笔记

https://github.com/gdut-yy/A-Philosophy-of-Software-Design-zh/blob/master/docs/ch7.md

创建装饰器类之前，请考虑以下替代方法：
您能否将新功能直接添加到基础类，而不是创建装饰器类？如果新功能是相对通用的，或者在逻辑上与基础类相关，或者如果基础类的大多数使用也将使用新功能，则这是有意义的。例如，几乎每个创建 Java InputStream 的人都会创建一个 BufferedInputStream，并且缓冲是 I/O 的自然组成部分，因此应该合并这些类。
如果新功能专用于特定用例，将其与用例合并而不是创建单独的类是否有意义？
您可以将新功能与现有的装饰器合并，而不是创建新的装饰器吗？这将导致一个更深的装饰器类，而不是多个浅的装饰器类。
最后，问问自己新功能是否真的需要包装现有功能

https://github.com/gdut-yy/A-Philosophy-of-Software-Design-zh/blob/master/docs/ch11.md

“两次设计”方法不仅可以改善您的设计，而且可以提高您的设计技能。设计和比较多种方法的过程将教您使设计更好或更坏的因素。随着时间的流逝，这将使您更容易排除不良的设计并磨练真正的出色设计

https://github.com/gdut-yy/A-Philosophy-of-Software-Design-zh/blob/master/docs/ch13.md

我最近一直在尝试一种方法，该方法将跨模块问题记录在一个名为 designNotes 的中央文件中。该文件分为清楚标记的部分，每个主要主题一个

Python doc

https://docs.python.org/zh-cn/3.8/glossary.html#term-docstring

wikipedia 缩进风格

https://zh.wikipedia.org/wiki/缩进风格

播客 shownotes 搜索引擎

https://www.listennotes.com/zh-hans/

wikipedia 计算机编程

https://zh.wikipedia.org/wiki/Category:计算机编程

中文自然语言 stopword

https://www.ranks.nl/stopwords/chinese-stopwords

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