# Replace character sequences renameDict.keys() with corresponding value in a text file

import re

import fileinput

renameDict = {9023001: 90010101, 803002: 90010201, 905003: 90010103}

patt = re.compile('|'.join([str(i) for i in renameDict.keys()]))

fn = r'H:\TEMP\temsys\sample_points6.txt'

# Using fileinput

for line in fileinput.input(fn, True, '.bak'):

matchList = re.findall(patt, line)

if matchList:

line = line.replace(matchList[0], str(renameDict[int(matchList[0])]))

print line.strip()

# Normal file iteration

lineList = open(fn).readlines()

for i, line in enumerate(lineList):

matchList = re.findall(patt, line)

if matchList:

lineList[i] = line.replace(matchList[0], str(renameDict[int(matchList[0])]))

print '%s was replaced by %s' % (matchList[0], str(renameDict[int(matchList[0])]))

f = open(fn, 'w')

f.writelines(''.join(lineList))

f.close()

'''

>>> 9023001 was replaced by 90010101

803002 was replaced by 90010201

905003 was replaced by 90010103

>>>

'''