code: def seek(self, offset, whence=0, mode='rw'):
          
          try:
              st = self._sndfile.seek(offset, whence, mode)
          except IOError, e:
              raise PyaudioIOError(str(e))
          return st
docs: similar to python seek function, taking only in account audio data.
  
          :Parameters:
              offset : int
                  the number of frames (eg two samples for stereo files) to move
                  relatively to position set by whence.
              whence : int
                  only 0 (beginning), 1 (current) and 2 (end of the file) are
                  valid.
              mode : string
                  If set to 'rw', both read and write pointers are updated. If
                  'r' is given, only read pointer is updated, if 'w', only the
                  write one is (this may of course make sense only if you open
                  the file in a certain mode).
  
          Notes
          -----
  
          - one only takes into accound audio data.
          - if an invalid seek is given (beyond or before the file), a
            PyaudioIOError is launched.