从python字符串中删除\\ xa0，\\ n，\\ t

Question

I have a list item, that I've converted into a string:

[u'\n                      Door:\xa0Novum          \t      ']

I need to remove everything so that Im left with

Door:Novum

I have tried various methods:

string = string.replace("\xa0", "")
string.rstrip('\n')
string.translate(string.maketrans("\n\t", ""))

I am obviously doing something wrong, but can't figure out what

Answer 1

You need to store the return value ; strings are immutable so methods return a new string with the change applied.

You can translate for all those characters, but use the unicode form of the method:

toremove = dict.fromkeys((ord(c) for c in u'\xa0\n\t '))
outputstring = inputstring.translate(toremove)

I'm assuming you wanted to get rid of spaces as well.

Demo:

>>> inputstring = u'\n                      Door:\xa0Novum          \t      '
>>> toremove = dict.fromkeys((ord(c) for c in u'\xa0\n\t '))
>>> outputstring = inputstring.translate(toremove)
>>> outputstring
u'Door:Novum'

A better method still would be to use str.split() , then join again:

outputstring = u''.join(inputstring.split())

\\xa0 , spaces, tabs and newlines are all included in what str.split() will split on, as well as carriage returns.

Demo:

>>> u''.join(inputstring.split())
u'Door:Novum'

This is better because it is a lot faster for this job than using str.translate() !

>>> import timeit
>>> timeit.timeit('inputstring.translate(toremove)', 'from __main__ import inputstring, toremove')
3.4527599811553955
>>> timeit.timeit('u"".join(inputstring.split())', 'from __main__ import inputstring')
0.5409181118011475