使用 readlines 导入后从 Python 列表中删除 \r\n
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Removing \r\n from a Python list after importing with readlines
提问by Justin
I have saved a list of ticker symbols into a text file as follows:
我已将股票代码列表保存到文本文件中，如下所示：
MMM
ABT
ABBV
ANF
....
Then I use readlines to put the symbols into a Python list:
然后我使用 readlines 将符号放入 Python 列表中：
stocks = open(textfile).readlines()
However, when I look at the list in it contains Windows end-of-line delimiter which I do not want:
但是，当我查看其中的列表时，它包含我不想要的 Windows 行尾分隔符：
list: ['MMM\r\n', 'ABT\r\n', 'ABBV\r\n', 'ANF\r\n', 'ACE\r\n', 'ACN\r\n', 'ACT\r\n', 'ADBE\r\n', 'ADT\r\n', 'AMD\r\n', 'AES\r\n', .....
Can someone suggest the easiest way to remove these unwanted characters?
有人可以建议删除这些不需要的字符的最简单方法吗？
回答by TheSoundDefense
You could replace \r\nwith the empty string in a replacecommand.
您可以用命令中\r\n的空字符串替换replace。
stocks = [x.replace("\r\n","") for x in stocks]
回答by ssm
readlines()should never be used unless you know that the file is really small. For your application, it is better to use rstrip()
readlines()除非您知道文件非常小，否则不应使用。对于您的应用程序，最好使用rstrip()
with open(filename, 'r') as f:
for l in f:
l = l.rstrip()
# other operations.
回答by roippi
That's basically how readlinesworks. You could post-process it:
这基本上是如何readlines工作的。您可以对其进行后处理：
stocks = [x.rstrip() for x in stocks]
But I prefer not using readlinesat all if I don't want EOL character(s), instead doing:
但readlines如果我不想要 EOL 字符，我宁愿不使用，而是这样做：
stocks = open(textfile).read().splitlines()
Or even better:
或者甚至更好：
with open(textfile) as f:
stocks = f.read().splitlines()
(it almost certainly won't make a difference here, but using context managers to explicitly close file objects is a good habit to get into)
（在这里几乎可以肯定不会有什么不同，但使用上下文管理器显式关闭文件对象是一个好习惯）
回答by martineau
You could do it like this:
你可以这样做：
stocks = open(textfile).read().splitlines()
