Python 错误 - 或者我的愚蠢 - 扫描字符串文字时 EOL [英] Python bug - or my stupidity - EOL while scanning string literal

问题描述

我看不出以下两行之间的显着差异.

然而第一个解析，而后者没有.

在 [5]: n=""" \\"Axis of Awesome\\" """在 [6] 中:n="""\\"真棒轴\\""""文件<ipython-input-6-d691e511a27b>"，第 1 行n="""\\"真棒轴\\""""^语法错误:扫描字符串文字时 EOL

这是 Python 错误/功能/奇怪，还是我遗漏了一些基本的东西?

解决方案

最后四个引号

"""\\"真棒轴\\""""

被解析为 """，即字符串的结尾，后跟 "，即新字符串文字的开始.但是，这个新文字永远不会完成.简单例子:

<预><代码>>>>"富""酒吧"'foobar'>>>"富""酒吧"'foobar'

如果你想避免这个问题，那么用 r' 替换 """ 或者转义 ":

<预><代码>>>>"""\\"真棒轴\\\""""'\\"真棒轴\\"'>>>r'\"真棒轴\"''\\"真棒轴\\"'

I cannot see a significant difference between the two following lines.

Yet the first parses, and the latter, does not.

In [5]: n=""" \\"Axis of Awesome\\" """

In [6]: n="""\\"Axis of Awesome\\""""
  File "<ipython-input-6-d691e511a27b>", line 1
    n="""\\"Axis of Awesome\\""""
                                ^
SyntaxError: EOL while scanning string literal

Is this a Python bug/feature/oddity, or have I missing something fundamental?

解决方案

The last four quote marks in

"""\\"Axis of Awesome\\""""

are parsed as """, i.e. end of string, followed by ", i.e. start of a new string literal. This new literal is never completed, though. Simple example:

>>> """foo""""bar"
'foobar'
>>> """foo""" "bar"
'foobar'

If you want to avoid this problem, then replace """ with r' or escape the ":

>>> """\\"Axis of Awesome\\\""""
'\\"Axis of Awesome\\"'
>>> r'\"Axis of Awesome\"'
'\\"Axis of Awesome\\"'

这篇关于Python 错误 - 或者我的愚蠢 - 扫描字符串文字时 EOL的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！