1 import sys,os
   2 
   3 Usage="""Source indentation converter tab to 4space
   4 
   5 tabTo4Space.py filename
   6 """
   7 try:
   8     fileName = sys.argv[1]
   9 except:
  10     print Usage
  11     sys.exit()
  12 
  13 wFile = open(fileName+'_','w')
  14 for line in open(fileName,'r').readlines():
  15     newLine=line.replace('\t','    ')
  16     wFile.writelines(newLine)
  17 
  18 try:
  19     os.rename(fileName+'_',fileName)
  20 except:
  21     pass