Re: remove the last character or the newline character?
- From: Tim Chase <python.list@xxxxxxxxxxxxxxxxx>
- Date: Thu, 28 Sep 2006 09:31:00 -0500
In [1]: fileName = 'Perfect Setup.txt\n'
In [2]: fileName = fileName[0:len(fileName)-1)] # remove the '\n'
character
In [3]: fileName
Out[3]: 'Perfect Setup.txt'
Question one:
Does python provide any function that can remove the last character of
a string?
I don't know whether or not the method I used is efficient
You're close...
fileName = fileName[0:-1]
which is the same as
fileName = fileName[:-1]
which will lop off the last character. Much nicer than most other languages I've used where you have to use the len() trick you're using. Also, it's a common python idiom you'll see frequently.
Question two:
Does python provide any function that can remove the newline character
from a string if it exists?
In a discussion on this very matter a while back, I think the final verdict was something like
fileName = fileName.rstrip('\n')
which will strip off *all* the trailing newlines. In most cases (such as "for line in file('foo.txt'):" code), there's only one to be stripped, so this works fine.
If you're ornary and want *only* the last '\n' lopped off, you'd have to test for it:
if fileName[-1] == '\n': fileName = fileName[:-1]
There were caveats regarding "\n" vs. "\r\n" line endings, but if the file comes in in ascii mode (rather than binary mode), Python more or less smart enough to do the translation for you, leaving the above code to work in the majority of cases.
-tkc
.
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- From: Daniel Mark
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