为什么反斜杠出现两次？ [英] Why do backslashes appear twice?

问题描述

当我创建一个包含反斜杠的字符串时，它们会被重复：

When I create a string containing backslashes, they get duplicated:

>>> my_string = "why\does\it\happen?"
>>> my_string
'why\\does\\it\\happen?'

为什么？

推荐答案

您所看到的是<$ c $的表示 c> my_string 由其 __ repr __（）创建 方法。如果你打印它，你可以看到你实际上有单反斜杠，就像你打算一样：

What you are seeing is the representation of the my_string created by its __repr__() method. If you print it, you can see that you've actually got single backslashes, just as you intended:

>>> print(my_string)
why\does\it\happen?

您可以使用 repr（） 内置函数：

You can get the standard representation of a string (or any other object) with the repr() built-in function:

>>> print(repr(my_string))
'why\\does\\it\\happen?'

Python代表字符串中的反斜杠为 \\ ，因为反斜杠是一个转义字符 - 例如 \\ n 表示换行符， \t 表示选项卡。

Python represents backslashes in strings as \\ because the backslash is an escape character - for instance, \n represents a newline, and \t represents a tab.

有时可能会让您陷入困境：

This can sometimes get you into trouble:

>>> print("this\text\is\not\what\it\seems")
this    ext\is
ot\what\it\seems

正因为如此，需要一种方法来告诉Python你真的想要两个字符 \\\
，而不是一个换行符，你可以通过转义另一个来反转斜杠本身：

Because of this, there needs to be a way to tell Python you really want the two characters \n rather than a newline, and you do that by escaping the backslash itself, with another one:

>>> print("this\\text\is\what\you\\need")
this\text\is\what\you\need

当Python返回一个字符串的表示形式时，它起着安全的作用，转义所有的反斜杠（即使它们不会成为零件）的转义序列），这就是你所看到的。但是，字符串本身只包含单个反斜杠。

When Python returns the representation of a string, it plays safe, escaping all backslashes (even if they wouldn't otherwise be part of an escape sequence), and that's what you're seeing. However, the string itself contains only single backslashes.

有关Python的字符串文字的更多信息，请参见：字符串和字节文字。

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