rstrip无法删除换行符char我在做什么错? [英] rstrip not removing newline char what am I doing wrong?

问题描述

在这里拉头发...最近一个小时一直在玩这个游戏，但是我不能让它做我想做的事，即.删除换行序列.

Pulling my hair out here... have been playing around with this for the last hour but I cannot get it to do what I want, ie. remove the newline sequence.

def add_quotes( fpath ):

        ifile = open( fpath, 'r' )
        ofile = open( 'ofile.txt', 'w' )

        for line in ifile:
            if line == '\n': 
                ofile.write( "\n\n" )
            elif len( line ) > 1:
                line.rstrip('\n')
                convertedline = "\"" + line + "\", "
                ofile.write( convertedline )

        ifile.close()
        ofile.close()

推荐答案

线索在rstrip的签名中.

它返回字符串的副本，但是去除了所需的字符，因此您需要为line分配新值:

It returns a copy of the string, but with the desired characters stripped, thus you'll need to assign line the new value:

line = line.rstrip('\n')

这允许有时非常方便的操作链接:

This allows for the sometimes very handy chaining of operations:

"a string".strip().upper()

为最大值. S 在评论中说，Python字符串是不可变的，这意味着任何变异"操作都将产生变异的副本.

As Max. S says in the comments, Python strings are immutable which means that any "mutating" operation will yield a mutated copy.

这就是它在许多框架和语言中的工作方式.如果确实需要可变的字符串类型(通常出于性能原因)，则可以使用字符串缓冲区类.

This is how it works in many frameworks and languages. If you really need to have a mutable string type (usually for performance reasons) there are string buffer classes.

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