message = f"Variable : child({type(child)}) -> is not of"\
        " type Node."

这个语法适合我。注意第二个语句的缩进，它应该缩进正确。

这些都是很好的答案，但我找不到一个编辑器插件，可以帮助我编辑“隐式连接”的字符串，所以我写了一个包，让我更容易。

在pip(安装段落)上，如果有人想查看这个旧线程的话。以html的方式格式化多行字符串(压缩空格，一个新段落有两个换行符，不用担心行间空格)。

from paragraphs import par


class SuddenDeathError(Exception):
    def __init__(self, cause: str) -> None:
        self.cause = cause

    def __str__(self):
        return par(
            f""" Y - e - e - e - es, Lord love you! Why should she die of
            {self.cause}? She come through diphtheria right enough the year
            before. I saw her with my own eyes. Fairly blue with it, she
            was. They all thought she was dead; but my father he kept ladling
            gin down her throat till she came to so sudden that she bit the bowl
            off the spoon. 

            What call would a woman with that strength in her have to die of
            {self.cause}? What become of her new straw hat that should have
            come to me? Somebody pinched it; and what I say is, them as pinched
            it done her in."""
        )


raise SuddenDeathError("influenza")

变得……

__main__.SuddenDeathError: Y - e - e - e - es, Lord love you! Why should she die of influenza? She come through diphtheria right enough the year before. I saw her with my own eyes. Fairly blue with it, she was. They all thought she was dead; but my father he kept ladling gin down her throat till she came to so sudden that she bit the bowl off the spoon.

What call would a woman with that strength in her have to die of influenza? What become of her new straw hat that should have come to me? Somebody pinched it; and what I say is, them as pinched it done her in.

一切都很容易与(Vim)对齐“gq”

可用的选项:

反斜杠:"foo" \ "bar" "foo" + " \ "bar" 括号: (“foo”“酒吧”) 带加号的括号:("foo" + "bar") PEP8, E502:括号之间的反斜杠是多余的

避免

避免使用逗号:("foo"， "bar")来定义一个元组。

>>> s = "a" \
... "b"
>>> s
'ab'
>>> type(s)
<class 'str'>

>>> s = "a" + \
... "b"
>>> s
'ab'
>>> type(s)
<class 'str'>

>>> s = ("a"
... "b")
>>> type(s)
<class 'str'>
>>> print(s)
ab

>>> s = ("a",
... "b")
>>> type(s)
<class 'tuple'>

>>> s = ("a" + 
... "b")
>>> type(s)
<class 'str'>
>>> print(s)
ab
>>> 

使用\你可以将语句扩展到多行:

s = "this is my really, really, really, really, really, really" + \
"really long string that I'd like to shorten."

应该工作。

您丢失了一个空格，您可能需要一个行延续字符，即。一个\。

s = "this is my really, really, really, really, really, really" +  \
    " really long string that I'd like to shorten."

甚至:

s = "this is my really, really, really, really, really, really"  \
    " really long string that I'd like to shorten."

parns也可以代替行续符，但可能会有人认为您打算使用元组，而只是忘记了逗号。举个例子:

s = ("this is my really, really, really, really, really, really"
    " really long string that I'd like to shorten.")

对比:

s = ("this is my really, really, really, really, really, really",
    " really long string that I'd like to shorten.")

使用Python的动态类型，代码可以以任何一种方式运行，但会产生不正确的结果。

因为相邻的字符串常量是自动连接的，你可以这样编码:

s = ("this is my really, really, really, really, really, really, "  
     "really long string that I'd like to shorten.")

注意没有加号，我在示例的格式后面添加了额外的逗号和空格。

就我个人而言，我不喜欢反斜杠，我记得在某个地方读到过，它的使用实际上是被反对的，而支持这种更明确的形式。记住“显式优于隐式”。

我认为反斜杠不太清楚，也不太有用，因为这实际上是转义换行符。如果需要的话，不能在它后面加上行结束注释。可以通过串接字符串常量来实现:

s = ("this is my really, really, really, really, really, really, " # comments ok
     "really long string that I'd like to shorten.")

我使用谷歌搜索“python行长”，它返回PEP8链接作为第一个结果，但也链接到另一个关于这个主题的StackOverflow帖子:“为什么python PEP-8应该指定79个字符的最大行长?”

另一个好的搜索短语是“python line continuation”。