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Python 中的Keyword-Only 参数

  • 2026-04-16 03:42:47
Python 中的Keyword-Only 参数
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“Keyword-Only 参数”是 3.0 版中添加的 Python 功能,   功能是只要启用了“Keyword-Only ”参数的声明:只能由关键字提供且永远不会由位置参数自动填充的参数, 它在 PEP 3102 中有描述,可读性很强,但我认为该功能可以从更多示例和基本原理中获益。

要理解Keyword-Only关键字参数,我们首先必须消除对 Python 位置参数和关键字参数的常见误解, 考虑以下功能:

defprint_greeting(nameuse_colors=False):# ...

我们通常将其视为具有一个位置参数和一个关键字参数,并期望调用代码将像这样使用它:

print_greeting("Mary")print_greeting("Mary"use_colors=True)print_greeting("Mary"use_colors=False)  # 冗余但明确

事实上,你也可以像下面这样调用这个函数(尽管看到这些形式通常会感到惊讶):

print_greeting("Mary"True)print_greeting(name="Mary")print_greeting(use_colors=Truename="Mary")

换句话说,两个参数都可以按位置或按名称传递, 从技术上讲,你应该将位置参数或关键字参数视为由函数调用而不是函数定义。

name 和 use_colors 之间的正确区别是 use_colors 有一个默认参数值,而 name 没有。

弄清楚这一点后,我们现在可以在脑海中区分两个不同的问题:

  • 当人们调用我们的函数时,我们应该鼓励或期望或强制他们使用关键字参数,还是位置参数?

  • 我们对每个参数都有一个好的默认值吗?

使用 Python 的Keyword-only关键字参数,我们可以独立地处理这两个问题。

为了使 use_colors 无法按位置传递,我们可以这样定义它:

defprint_greeting(name*use_colors=False):# ...

这带来了一些优点:

  • 它使调用代码更明确(但也更冗长), 将不再可能看到如下代码:

print_greeting("Mary"True)

......乍一看看会想知道“那个布尔参数是什么意思?”

  • 它允许我们作为函数作者添加更多关键字参数,以我们想要的任何顺序定义,而不会破坏使用我们函数,因为他们是按位置而不是按名称传递参数。

一旦我们有了这些Keyword-only限关键字的参数,我们还可以问“我们真的有好的默认值吗?” 假设我们意识到颜色代码的使用非常重要,并且每次使用 print_greeting 函数时都必须传递——我们没有一个好的默认值, 我们可以这样写我们的函数:

defprint_greeting(name*use_colors):pass

然后调用:

print_greeting("Mary"use_colors=True)

如果调用者未能传递 use_colors,他们会看到此错误消息:

TypeErrorprint_greeting() missing1requiredkeyword-onlyargument'use_colors'

目前还没有看到那么多Keyword-only关键字参数的使用,但这个特性非常重要,大家可以更多的使用这个特性使自己的代码更加健壮。

原文:https://lukeplant.me.uk/blog/posts/keyword-only-arguments-in-python/

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  1. CONNECT:[ UseTime:0.000935s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001379s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.011092s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003558s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001407s ]
  6. SELECT * FROM `set` [ RunTime:0.003591s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001660s ]
  8. SELECT * FROM `article` WHERE `id` = 485497 LIMIT 1 [ RunTime:0.055893s ]
  9. UPDATE `article` SET `lasttime` = 1776368409 WHERE `id` = 485497 [ RunTime:0.005482s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000733s ]
  11. SELECT * FROM `article` WHERE `id` < 485497 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001286s ]
  12. SELECT * FROM `article` WHERE `id` > 485497 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001583s ]
  13. SELECT * FROM `article` WHERE `id` < 485497 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.009798s ]
  14. SELECT * FROM `article` WHERE `id` < 485497 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.048371s ]
  15. SELECT * FROM `article` WHERE `id` < 485497 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008142s ]
0.309143s