def set_dashes(self, seq):
if seq == (None, None) or len(seq)==<NUM_LIT:0>:<EOL><INDENT>self.set_linestyle('<STR_LIT:->')<EOL><DEDENT>else:<EOL><INDENT>self.set_linestyle('<STR_LIT>')<EOL><DEDENT>self._dashSeq = seq<EOL>
Set the dash sequence, sequence of dashes with on off ink in
points.  If seq is empty or if seq = (None, None), the
linestyle will be set to solid.

ACCEPTS: sequence of on/off ink in points