parameters: (f)
docstring: Used to modify mtime in cached files;
      mtime is used by the purge command
docstring_summary: Used to modify mtime in cached files;
      mtime is used by the purge command
docstring_tokens: Used to modify mtime in cached files ; mtime is used by the purge command
function: def touch(f):
      """Used to modify mtime in cached files;
      mtime is used by the purge command"""
      try:
          os.utime(f, None)
      except OSError:
          log.warn('impossible to update utime of file %s' % f)
function_tokens: def touch ( f ) : try : os . utime ( f , None ) except OSError : log . warn ( 'impossible to update utime of file %s' % f )