def set_dash_joinstyle(self, s):
s = s.lower()<EOL>if s not in self.validJoin:<EOL><INDENT>raise ValueError('<STR_LIT>' % (s,)<EOL>+ '<STR_LIT>' % (self.validJoin,))<EOL><DEDENT>self._dashjoinstyle = s<EOL>
Set the join style for dashed linestyles
ACCEPTS: ['miter' | 'round' | 'bevel']