我应该在函数调用的最后一个参数后面添加一个尾随逗号？ [英] Should I add a trailing comma after the last argument in a function call?

问题描述

最好做什么？

self.call(1, True, "hi")

或

self.call(1, True, "hi",)

p>

And what in the following cases:

self.call(
    1,
    True,
    "hi"
)

或

self.call(
    1,
    True,
    "hi",
)

？

在数据结构中添加尾随逗号的原因是我熟悉的， p>

Reasons for adding a trailing comma in data structures are familiar to me, but what about function calls?

推荐答案

我认为没有技术原因可以避免在函数调用中使用斜杠，但有些人可能会发现他们分心。有些人可能会停下来说，嗯，我想知道这真的应该在那里吗？

I think there's no technical reason to avoid trailing slashes in function calls, but some people probably do find them distracting. Some may stop and say, "Hmmm, I wonder if that's really supposed to be there?"

我不犹豫地将此称为优点，但是使用尾部斜杠连同缩进样式的一个效果是使版本控制差异

I hesitate to call this a benefit, but one effect of using trailing slashes in conjunction with an indented style is to make version control diffs look a little bit cleaner when adding an argument.

例如，这样的函数：

def my_fun(a, b, c=None):
    ...

$ b b

...这样调用：

...called like this:

my_fun(
    a='abc',
    b=123
)

...然后更改为：

my_fun(
    a='abc',
    b=123,
    c='def'
)

在git中产生此差异：

produces this diff in git:

$ git diff
...
 my_fun(
     a='abc',
-    b=123
+    b=123,
+    c='def'
 )

Whereas,

my_fun(
    a='abc',
    b=123,
)

更改为...

my_fun(
    a='abc',
    b=123,
    c='def',
)

在git中生成此差异：

produces this diff in git:

$ git diff
...
 my_fun(
     a='abc',
     b=123,
+    c='def',
 )

这篇关于我应该在函数调用的最后一个参数后面添加一个尾随逗号？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！