@deprecated装饰器对函数的使用

问题描述

是否有一个linter能够检测到@deprecated包中的deprecated装饰器将其标记为已弃用的功能的使用情况?

例如在

from deprecated import deprecated

def realfun():
    print('Hey there')

@deprecated(reason="this is a test")
def myfun():
    realfun()

if __name__ == "__main__":
    myfun()

PYTHONWARNINGS="default::DeprecationWarning" python testfile.py运行时,我会收到运行时警告,但pylintmypyflake8似乎(至少是如何运行)对此感到满意呼叫myfun

解决方法

正如其他人所提到的,您必须编写一个自定义pylint检查器。运作方式是定义一个pylint的{​​{1}}的子类,并定义发出什么警告以及何时发出警告。

以下代码正是这样做的。它是针对BaseChecker包的特定关键字参数量身定制的,但是通常只要有人使用称为deprecated的修饰符来标记函数或类,它就可以正常工作,并且会发出deprecated警告{ {1}}(可以随意更改,例如更改为错误)。它还应提供信息性消息。

要使用它,请将代码添加到名为(例如)pylint的文件中,然后将包含W0001的文件夹添加到deprecated_checker.py或将源代码添加到{{ 1}}文件夹。然后,您可以通过运行带有选项deprecated_checker.py的{​​{1}}来完成工作。

有关编写自己的检查器的更多信息,look here

PYTHONPATH

如果您已完成所有操作,请整理存根文件pylint/checkers

pylint

使用命令--load-plugins=deprecated_checker可以帮助您

from astroid.nodes import Call,ClassDef,FunctionDef,Name
from pylint.checkers import BaseChecker
from pylint.interfaces import IAstroidChecker


class DeprecatedChecker(BaseChecker):
    __implements__ = IAstroidChecker

    name = "no-deprecated"
    priority = -1
    msgs = {
        "W0001": (
            "%s %s is deprecated since version %s; reason: %s.","deprecated","Functions that have been marked via annotations as deprecated should not be used.",)
    }

    def __init__(self,linter=None):
        super().__init__(linter)

    def visit_decorators(self,node):
        # Check if there are decorators
        if node.nodes is None:
            return

        # Figure out whether its a class or function
        # that is deprecated,and get relevant info
        if isinstance(node.parent,ClassDef):
            parent_type = "Class"
        elif isinstance(node.parent,FunctionDef):
            parent_type = "Function"
        parent_name = node.parent.name

        # Check each decorator to see if its deprecating
        for decorator in node.get_children():
            if isinstance(decorator,Call):
                if decorator.func.name == "deprecated":
                    version = "(not specified)"
                    reason = "not specified"
                    if decorator.keywords is not None:
                        for kw in decorator.keywords:
                            if kw.arg == "version":
                                version = f'"{kw.value.value}"'
                            if kw.arg == "reason":
                                reason = f'"{kw.value.value}"'
                    self.add_message(
                        "deprecated",node=node.parent,args=(parent_type,parent_name,version,reason),)
            elif isinstance(decorator,Name):
                if decorator.name == "deprecated":
                    self.add_message(
                        "deprecated",args=(
                            parent_type,"(not specified)","not specified",),)

def register(linter):
    linter.register_checker(DeprecatedChecker(linter))
,

您应该查看How to warn about class (name) deprecation,以便将自己的规则添加到皮棉中。没有用于标记弃用的标准库方法,因此它不会内置在工具中。最接近的是warnings库中的特定类。

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