Python: Find Replace in a Dir

By Xah Lee. Date: . Last updated: .

Here's a script that does Find and Replace on all files in a dir.

For regex, see Python: Find Replace by Regex

# -*- coding: utf-8 -*-
# python

# script for multiple find/replace pairs for all HTML files in a directory.

import os,sys

inputDir = "/Users/jane/web/"

fileExtension = ".html"

findreplace = [
    # find string, replace string. Each can be multi-lines
(u'''some find
string here''' ,

u'''replace string here'''),

(u'more here' , u'and here')
]

def replaceStringInFile(filePath):
   "replaces all findStr by repStr in file filePath"
   tempName = filePath+'~~~'

   inputFile = open(filePath)
   outputFile = open(tempName, 'w')
   fContent = unicode(inputFile.read(), "utf-8")

   for aPair in findreplace:
       outputText = fContent.replace(aPair[0], aPair[1])
       fContent = outputText

   outputFile.write(outputText.encode("utf-8"))

   outputFile.close()
   inputFile.close()

   print "processed {}".format(filePath)
   os.rename(tempName, filePath)

def fileFilter(dummyArg, thisDir, dirChildrenList):
    for thisChild in dirChildrenList:
        if fileExtension == os.path.splitext(thisChild)[1] and os.path.isfile(thisDir+'/'+thisChild):
            replaceStringInFile(thisDir+'/'+thisChild)

os.path.walk(inputDir, fileFilter, None)

print 'done'

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Python by Example

  1. Python Basics
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  3. Builtin Help
  4. Quote String
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Regex

  1. Regex Basics
  2. Regex Reference

Text Processing

  1. Read/Write File
  2. Traverse Directory
  3. Manipulate Path
  4. Process Unicode
  5. Convert File Encoding
  6. Find Replace in dir
  7. Find Replace by Regex
  8. Count Word Frequency

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Advanced

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  9. Keyword Arg Default Value Unstable

Reference