[Tutor] wierd replace problem

[Roelof Wobben]

----------------------------------------
Date: Mon, 13 Sep 2010 12:17:47 -0400
From: michael at trollope.org
To: tutor at python.org
Subject: Re: [Tutor] wierd replace problem


On Mon, Sep 13, 2010 at 12:19:23PM +0000, Roelof Wobben wrote:
>
> Hello,
>
> I have this string called test with the contents of 'het is een wonder \\TIS'
>
> Now I want to get rid of the \\ so I do this : test2 = test.replace ('\\', '')
> And I get at the python prompt this answer : 'het is een wonder TIS'
> So that's right.
>
> Now I try the same in a IDE with this programm :
>
> woorden =[]
> letter_counts = {}
> file = open ('alice_in_wonderland.txt', 'r')
> for line in file:
> line2 = line.replace ("\\","")
> line3 = line2.lower()
> woorden = line3.split()
> for letter in woorden:
> letter_counts[letter] = letter_counts.get (letter, 0) + 1
> letter_items = letter_counts.items()
> letter_items.sort()
> print letter_items
>
> But now Im gettting this output :
>
> [('"\'tis', 1),
>
> Why does the \ stays here. It should have gone as the test in the python prompt says.

Hello,

Actually, on closer look I can see the answer.

The original text must look something like this:

\\"'tis the season to be jolly," said santa.

When you run your process against a string in that format, you get the
output shown: ('"\'tis', 1). The appearance of the backslash is
fortuitous. It has nothing to do with the string.replace(), it's
there to escape the single quote, which is appearing in the middle of
a single-quoted string. IF the double-quote had not also been there,
python would have replaced the outer quotes with double quotes, as it
does on my system before I got to thinking about that lonely double
quote.

Thanks.

mp

--
Michael Powe michael at trollope.org Naugatuck CT USA
"I wrote what I did because as a woman, as a mother, I was oppressed
and brokenhearted with the sorrows and injustice I saw, because as a
Christian I felt the dishonor to Christianity, -- because as a lover
of my country, I trembled at the coming day of wrath." -- H.B. Stowe

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Hello Michael,
 
The original text is this : 
 
`'Tis so,' said the Duchess:  `and the moral of that is--"Oh,
'tis love, 'tis love, that makes the world go round!"'

So I think I have to replace the '.
 
Roelof