Python按索引删除部分字符串
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Python Remove Parts of string by index
提问by Brian
I have a string
我有一个字符串
string='texttexttextblahblah",".'
and what I want to do is cut of some of the rightmost characters by indexing and assign it to stringso that stringwill be equal to texttexttextblahblah"
我想要做的是通过索引剪切一些最右边的字符并将其分配给它，string以便string等于texttexttextblahblah"
I've looked around and found how to print by indexing, but not how to reassign that actual variable to be trimmed.
我环顾四周，发现如何通过索引进行打印，但没有找到如何重新分配要修剪的实际变量。
采纳答案by Nick T
Just reassign what you printed to the variable.
只需将您打印的内容重新分配给变量即可。
>>> string='texttexttextblahblah",".'
>>> string = string[:-3]
>>> string
'texttexttextblahblah"'
>>>
Also, avoid using names of libraries or builtins (string) for variables
此外，避免使用库名称或内置函数 ( string) 作为变量
Unless you know exactly how many textand blah's you'll have, use .find()as Brent suggested (or .index(x), which is like find, except complains when it doesn't find x).
除非您确切知道您将拥有多少个text和blah's，否则请.find()按照 Brent 建议的方式使用（或者.index(x)，就像 find 一样，除非在没有 find 时抱怨x）。
If you want that trailing ", just add one to the value it kicks out. (or just findthe value you actually want to split at, ,)
如果您想要尾随"，只需在它踢出的值上加一个。（或者只是find您实际想要拆分的值，,）
mystr = mystr[:mystr.find('"') + 1]
回答by Brent Writes Code
Strings are immutable so you can't really change the string in-place. You'll need to slice out the part you want and then reassign it back over the original variable.
字符串是不可变的，因此您无法真正就地更改字符串。您需要切出所需的部分，然后将其重新分配回原始变量。
Is something like this what you wanted? (note I left out storing the index in a variable because I'm not sure how you're using this):
这是你想要的吗？（请注意，我没有将索引存储在变量中，因为我不确定您是如何使用它的）：
>>> s = 'texttexttextblahblah",".'
>>> s.index('"')
20
>>> s = s[:20]
>>> s
'texttexttextblahblah'
回答by John La Rooy
If you needsomething that works like a string, but is mutableyou can use a bytearray
如果您需要像字符串一样工作但可变的东西，您可以使用字节数组
>>> s=bytearray('texttexttextblahblah",".')
>>> s[20:]=''
>>> print s
texttexttextblahblah
bytearray has all the usual string methods
bytearray 具有所有常用的字符串方法
回答by Tony Veijalainen
I myself prefer to do it without indexing: (My favorite partition was commented as winner in speed and clearness in comments so I updated the original code)
我自己更喜欢在没有索引的情况下进行：（我最喜欢的分区在评论中被评论为速度和清晰度方面的赢家，所以我更新了原始代码）
s = 'texttexttextblahblah",".'
s,_,_ = s.partition(',')
print s
Result
结果
texttexttextblahblah"
