Python 打印两个反斜杠而不是一个 [英] Python prints two backslash instead of one

问题描述

我的目标是在 Python3 中打印一个反斜杠.我的输入是

links22 = ['1',"n","nkf"]treee = ['<img src={} \>'.format(i) for i in links22]打印(树)

我得到的输出是:

['<img src=1 \\>', '<img src=n \\>', '<img src=nkf \\>']

当我尝试时:

print("\\")

输出为:

<预><代码>\

我想弄清楚为什么第一个输出是 \ 而第二个是 .

解决方案

您可以在这里找到答案:https://docs.python.org/3/library/re.html?highlight=comment%20strings

<预><代码>\

转义特殊字符(允许您匹配诸如*"、?"等字符)，或表示特殊序列；下面讨论特殊序列.

Python 字符串文字支持的大多数标准转义符也被正则表达式解析器接受:

\a \b \f \n\N \r \t \u\U \v \x \\

My goal is to print a backslash in Python3. My input is

links22 = ['1',"n","nkf"]
treee = ['<img src={} \>'.format(i) for i in links22]
print(treee)

The output that I get is:

['<img src=1 \\>', '<img src=n \\>', '<img src=nkf \\>']

And when I try:

print("\\")

The output is:

\

I want to figure out why the first output is \ and in the second is .

解决方案

The answer you can find here: https://docs.python.org/3/library/re.html?highlight=comment%20strings

\

Either escapes special characters (permitting you to match characters like '*', '?', and so forth), or signals a special sequence; special sequences are discussed below.

Most of the standard escapes supported by Python string literals are also accepted by the regular expression parser:

\a      \b      \f      \n
\N      \r      \t      \u
\U      \v      \x      \\

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