Velocity Reviews - Computer Hardware Reviews

Velocity Reviews > Newsgroups > Programming > Python > Re: Find and replace is appending when run more than once ...

Thread Tools

Re: Find and replace is appending when run more than once ...

Posts: n/a
      04-17-2009 Removed) wrote:
> Hello,
> I grabbed some sample code from the web and put together this python
> script which searches all subdirectories for a specific file type, then
> replaces a string with a new one. Out of curiosity I ran it again.
> Here's what happens (this also happens for the files I am looking to
> replace OutputPath=Z:\ with OutputPath=Z:\DXF):
> 1st run: replaces OutputPath=Z:\ with OutputPath=Z:\CSV )
> 2nd run: replaces OutputPath=Z:\CSV with OutputPath=Z:\CSV\CSV
> 3rd run: replaces OutputPath=Z:\CSV\CSV with OutputPath=Z:\CSV\CSV\CSV
> And so on.
> I cant figure out why it's doing this if I am searching a certain string
> value and replacing it. I am also perplexed on why it is only adding
> the "CSV" each time rather than the full string. What I want it to do
> is only replace once. Next time I run it it shouldn't do anything.
> import fnmatch,os,sys
> mydir = 'C:\\!DOMSExtractor'
> findStr = 'OutputPath=Z:\\'
> def replaceStringInFile(findStr,replStr,filePath):
> tempName=filePath+'~~~'
> input = open(filePath)
> output = open(tempName,'w')
> for s in input:
> print findStr
> print replStr
> output.write(s.replace(findStr,replStr))

This is replacing 'OutputPath=Z:\\' with 'OutputPath=Z:\\CSV\\' because
findStr is 'OutputPath=Z:\\' and replStr is 'OutputPath=Z:\\CSV\\'.
Unfortunately replStr starts with findStr, so if you had:


then you would get:


Notice that this string still contains 'OutputPath=Z:\\', so doing it
again would result in:


Perhaps you could do something like this:

# Start with:
# 'fooOutputPath=Z:\\bar'
# or:
# 'fooOutputPath=Z:\\CSV\\bar'

new_s = s.replace(findStr, replStr + '*')

# Now have:
# 'fooOutputPath=Z:\\CSV\\*bar'
# or:
# 'fooOutputPath=Z:\\CSV\\*CSV\\bar'

new_s = new_s.replace('\\*CSV', '')

# Now have:
# 'fooOutputPath=Z:\\CSV\\*bar'
# or:
# 'fooOutputPath=Z:\\CSV\\bar'

new_s = new_s.replace('CSV\\*', 'CSV\\')

# Now have:
# 'fooOutputPath=Z:\\CSV\\bar'
# or:
# 'fooOutputPath=Z:\\CSV\\bar'

> output.close()
> input.close()
> os.remove(filePath)
> os.rename(tempName,filePath)
> print filePath
> def myfun(dummy, dirr, filess):
> for child in filess:
> filePath = dirr+'/'+child
> if '.ini' == os.path.splitext(child)[1] and
> os.path.isfile(filePath):
> print file(filePath, 'rb').read().find(findStr)
> if file(filePath, 'rb').read().find(findStr) <> -1:
> if fnmatch.fnmatch(dirr+'/'+child, '*BGExtract.ini'):
> replaceStringInFile(findStr,'OutputPath=Z:\\DXF\\' ,filePath)
> elif fnmatch.fnmatch(dirr+"/"+child, '*GISExtract.ini'):
> replaceStringInFile(findStr,'OutputPath=Z:\\CSV\\' ,filePath)
> os.path.walk(mydir, myfun, 3)

Reply With Quote

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Find more than one error at once Joseph Turian Python 4 05-10-2008 11:42 PM
Like all great travelers, I have seen more than I remember andremember more than I have seen. C++ 0 03-05-2008 08:41 AM
Like all great travelers, I have seen more than I remember andremember more than I have seen. C Programming 0 03-05-2008 03:26 AM
Can't run BLT program more than once? Todd Krein Python 0 04-28-2005 07:46 PM
Regex to match say char 't' exactly once in a string and no more than once Gancy Perl Misc 4 02-03-2005 02:19 PM