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Unique file name (counter)

/ Published in: Python
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  1. import itertools
  2. import os
  3. import re
  4.  
  5. def unique_file_name(file):
  6.     ''' Append a counter to the end of file name if 
  7.     such file allready exist.'''
  8.     if not os.path.isfile(file):
  9.         # do nothing if such file doesn exists
  10.         return file 
  11.     # test if file has extension:
  12.     if re.match('.+\.[a-zA-Z0-9]+$', os.path.basename(file)):
  13.         # yes: append counter before file extension.
  14.         name_func = \
  15.             lambda f, i: re.sub('(\.[a-zA-Z0-9]+)$', '_%i\\1' % i, f)
  16.     else:
  17.         # filename has no extension, append counter to the file end
  18.         name_func = \
  19.             lambda f, i: ''.join([f, '_%i' % i])
  20.     for new_file_name in \
  21.             (name_func(file, i) for i in itertools.count(1)):
  22.         if not os.path.exists(new_file_name):
  23.             return new_file_name

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