如何在Python中修剪字符？
对 Python 很陌生，有一个非常简单的问题。我想从字符串中删除最后 3 个字符。这样做的有效方法是什么？
示例 I am go 变为 I am go
Very new to Python and have very simple question. I would like to trim the last 3 characters from string. What is the efficient way of doing this?
Example I am going becomes I am go
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您可以使用
new_str = old_str[:-3]，这表示从开头到结尾之前的三个字符。You can use
new_str = old_str[:-3], that means all from the beginning to three characters before the end.如果只是考虑字符数，切片听起来是您所追求的最合适的用例；但是，如果您知道要从字符串中修剪的实际字符串，您可以执行 rstrip
更新
抱歉造成误导，但这些示例具有误导性，
rstrip的参数没有被处理为有序字符串，而是被处理为一个无序的字符集。所有这些都是等效的
更新2
如果正在寻求后缀和前缀剥离，现在有专门的内置支持这些操作。
https://www.python .org/dev/peps/pep-0616/#remove-multiple-copies-of-a-prefix
Slicing sounds like the most appropriate use case you're after if it's mere character count; however if you know the actual string you want to trim from the string you can do an rstrip
UPDATE
Sorry to have mislead but these examples are misleading, the argument to
rstripis not being processed as an ordered string but as an unordered set of characters.all of these are equivalent
Update 2
If suffix and prefix stripping is being sought after there's now dedicated built in support for those operations.
https://www.python.org/dev/peps/pep-0616/#remove-multiple-copies-of-a-prefix
使用字符串切片。
Use string slicing.
您可以在字符串名称后面添加 [:-3]。这将为您提供一个字符串，其中包含从头开始到倒数第三个字符的所有字符。或者，如果您想删除前 3 个字符，可以使用 [3:]。同样，[3:-3] 会给你一个字符串，其中前 3 个字符被删除，最后 3 个字符被删除。
You could add a [:-3] right after the name of the string. That would give you a string with all the characters from the start, up to the 3rd from last character. Alternatively, if you want the first 3 characters dropped, you could use [3:]. Likewise, [3:-3] would give you a string with the first 3, and the last 3 characters removed.