如何删除python中字符串的最后一个字符？
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How can I remove the last character of a string in python?
提问by
I have a file path as a string and trying to remove the last '/' from the end.
我有一个作为字符串的文件路径，并试图从末尾删除最后一个 '/'。
my_file_path = '/home/ro/A_Python_Scripts/flask-auto/myDirectory/scarlett Johanson/1448543562.17.jpg/'
I've been trying it with regex but it just keeps removing all the '/'. Is there any easier way to just remove the last character without regex?
我一直在用正则表达式尝试它，但它只是不断删除所有的“/”。有没有更简单的方法来删除没有正则表达式的最后一个字符？
回答by Alasdair
As you say, you don't need to use a regex for this. You can use rstrip.
正如您所说，您不需要为此使用正则表达式。您可以使用rstrip.
my_file_path = my_file_path.rstrip('/')
If there is more than one /at the end, this will remove all of them, e.g. '/file.jpg//'-> '/file.jpg'. From your question, I assume that would be ok.
如果最后有多个/，这将删除所有这些，例如'/file.jpg//'-> '/file.jpg'。从你的问题来看，我认为这没问题。
回答by joksnet
You could use String.rstrip.
你可以使用String.rstrip.
result = string.rstrip('/')
回答by Yann Vernier
To remove the last character, just use a slice: my_file_path[:-1]. If you only want to remove a specific set of characters, use my_file_path.rstrip('/'). If you see the string as a file path, the operation is os.path.dirname. If the path is in fact a filename, I rather wonder where the extra slash came from in the first place.
要删除最后一个字符，只需使用切片：my_file_path[:-1]。如果您只想删除一组特定的字符，请使用my_file_path.rstrip('/'). 如果您将字符串视为文件路径，则操作为os.path.dirname。如果路径实际上是一个文件名，我就想知道额外的斜线是从哪里来的。
回答by sarath joseph
The easiest is
最简单的是
as @greggo pointed out
正如@greggo 指出的那样
string="mystring";
string[:-1]
回答by djangoliv
For a path use os.path.abspath
对于路径使用 os.path.abspath
import os
print os.path.abspath(my_file_path)
回答by SIslam
No need to use expensive regex, if barely needed then try-
Use r'(/)(?=$)'pattern that is capture last /and replace with r''i.e. blank character.
无需使用昂贵的regex，如果几乎不需要，则尝试使用r'(/)(?=$)'最后捕获的模式/并替换为r''空白字符。
>>>re.sub(r'(/)(?=$)',r'','/home/ro/A_Python_Scripts/flask-auto/myDirectory/scarlett Johanson/1448543562.17.jpg/')
>>>'/home/ro/A_Python_Scripts/flask-auto/myDirectory/scarlett Johanson/1448543562.17.jpg'
回答by tglaria
Answering the question: to remove the last character, just use:string = string[:-1].
回答问题：要删除最后一个字符，只需使用：string = string[:-1]。
If you want to remove the last '\' if there is one (or if there is more than one):
如果你想删除最后一个 '\' 如果有一个（或者如果有多个）：
while string[-1]=='\':
string = string[:-1]
If it's a path, then use the os.pathfunctions:
如果是路径，则使用以下os.path函数：
dir = "dir1\dir2\file.jpg\" #I'm using windows by the way
os.path.dirname(dir)
although I would 'add' a slash in the end to prevent missing the filename in case there's no slash at the end of the original string:
尽管我会在末尾“添加”一个斜杠以防止丢失文件名，以防原始字符串的末尾没有斜杠：
dir = "dir1\dir2\file.jpg"
os.path.dirname(dir + "\")
When using abspath, (if the path isn't absolute I guess,) will add the current working directory to the path.
使用 abspath 时，（如果路径不是绝对路径，我猜）会将当前工作目录添加到路径中。
os.path.abspath(dir)
回答by Roshan Shibu
The simplest way is to use slice. If x is your string variable then x[:-1] will return the string variable without the last character. (BTW, x[-1] is the last character in the string variable) You are looking for
最简单的方法是使用切片。如果 x 是您的字符串变量，则 x[:-1] 将返回没有最后一个字符的字符串变量。（顺便说一句，x[-1] 是字符串变量中的最后一个字符）您正在寻找
my_file_path = '/home/ro/A_Python_Scripts/flask-auto/myDirectory/scarlett Johanson/1448543562.17.jpg/' my_file_path = my_file_path[:-1]
my_file_path = '/home/ro/A_Python_Scripts/flask-auto/myDirectory/scarlett Johanson/1448543562.17.jpg/' my_file_path = my_file_path[:-1]
