行尾反斜杠的目的是什么? [英] What is the purpose of a backslash at the end of a line?

问题描述

刚刚在 Python 代码中发现以下模块导入:

Just found the following module import in a Python code:

from sqlalchemy.ext.declarative import declarative_base,
      AbstractConcreteBase

我对第一行末尾的反斜杠 很好奇.它的目的是什么?不会和下面一样吗?

I am curious about the backslash at the end of the first line. What's the purpose of it? Wouldn't it be the same as the following?

from sqlalchemy.ext.declarative import declarative_base, AbstractConcreteBase

推荐答案

是的，完全一样，这就是反斜杠的点——它转义换行符，允许将这条长行分成两部分.另一种方法是使用括号:

Yep, it's exactly the same and this is the point of the backslash — it escapes the newline, allowing this long line to be split in two. An alternative is to use parentheses:

from sqlalchemy.ext.declarative import (declarative_base,
      AbstractConcreteBase)

虽然这是一个语法错误:

While this is a syntax error:

from sqlalchemy.ext.declarative import declarative_base,
      AbstractConcreteBase

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