英文:

Why does a \ change what is in a string in python?

问题 {#heading}

我最近注意到在Python字符串中，符号\与其他字符的行为不同。

例如：print('ab' + '\cde') 打印出预期的 ab\cde，但 print('a'+'\bcde') 只打印出 cde。

我想知道这背后的原因是什么。
我目前正在使用Python 11，所以可能是新版本的一个故障吗？到目前为止，我能想到的唯一可能性。 英文:

I recently noticed that the symbol \ behaves differently in a python string than other characters.

For example: print('ab' + '\cde') prints ab\cde as expected, but print('a'+'\bcde') only prints cde.

I was wondering what the reason for this was.
I am currently using python 11, so it may be a glitch with the new version? Only thing I can think of so far.

答案1 {#1}

得分: 1

以下是已翻译的内容：

在许多编程语言中，包括Python，\字符用于转义序列。如果您想查看其中一些转义序列，这是到Python的转义序列的链接。

原因是

print('a'+'\bcde')

只打印

cde

这是因为\b是退格字符的转义序列。因此，它会后退一个字符（退格），然后下一个打印的字符c会覆盖a。如果您需要打印\字符，请使用\\。但是，正如您注意到的

print('ab' + '\cde')

没有类似的效果，而是打印

ab\cde

这是因为\c不是一个转义序列，Python会按照字符串的原样打印它。

资源：

• w3schools)
• Stack Overflow
• Python Guides

英文:

The \ character is used for escape sequences in many programming languages, including Python. Here's a link to python's escape sequences if you wanted to see some of them.

The reason

print('a'+'\bcde')

only prints

cde

is because \b is the escape sequence for a backspace character. So it will move back one character (backspace), and the next character printed, c, overwrites the a. If you need to print a \ character, use \\. However, as you noticed

print('ab' + '\cde')

does not have a similar effect, and instead prints

ab\cde

This is because \c is not an escape sequence, and instead, Python will print the string the way it is.

Resources:

• w3schools
• Stack Overflow
• Python Guides