在问这个问题时,我意识到我对原始字符串知之甚少.对于那些自称是Django训练师的人来说,这很糟糕.
我知道编码是什么,而且我知道u''自从我得到什么是Unicode以来我们独自做了什么.
但到底r''做了什么呢?它会产生什么样的字符串?
And above all, what the heck does ur'' do?
Finally, is there any reliable way to go back from a Unicode string to a simple raw string?
Ah, and by the way, if your system and your text editor charset are set to UTF-8, does u'' actually do anything?
在Python中使用正则表达式编译有什么好处吗?
h = re.compile('hello')
h.match('hello world')
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VS
re.match('hello', 'hello world')
Run Code Online (Sandbox Code Playgroud) 我需要一些关于声明正则表达式的帮助.我的输入如下:
this is a paragraph with<[1> in between</[1> and then there are cases ... where the<[99> number ranges from 1-100</[99>.
and there are many other lines in the txt files
with<[3> such tags </[3>
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所需的输出是:
this is a paragraph with in between and then there are cases ... where the number ranges from 1-100.
and there are many other lines in the txt files
with such tags
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我试过这个:
#!/usr/bin/python
import os, sys, re, glob
for infile in glob.glob(os.path.join(os.getcwd(), '*.txt')):
for …Run Code Online (Sandbox Code Playgroud) 我想循环遍历文本文件的内容,并在某些行上进行搜索和替换,并将结果写回文件.我可以先将整个文件加载到内存中然后再写回来,但这可能不是最好的方法.
在以下代码中,最好的方法是什么?
f = open(file)
for line in f:
if line.contains('foo'):
newline = line.replace('foo', 'bar')
# how to write this newline back to the file
Run Code Online (Sandbox Code Playgroud) 我有一些字符串可能包含某事物的缩写或全名,我想将它们全部替换为该单词的相同变体。
例如,
“8 gigs”、“8 GB”和“8 GBs”应全部更改为“8 GB”
最好的方法是什么?每个人都有单独的替换吗?
另外,我试图对多个单词(即兆字节、太字节)执行此操作,每个单词是否都需要不同的替换,或者是否有一种方法将它们全部放在一个单词中?