pretty.py 文件源码

def _print_ProductSet(self, p):
        if len(p.sets) > 1 and not has_variety(p.sets):
            from sympy import Pow
            return self._print(Pow(p.sets[0], len(p.sets), evaluate=False))
        else:
            prod_char = u"\N{MULTIPLICATION SIGN}" if self._use_unicode else 'x'
            return self._print_seq(p.sets, None, None, ' %s ' % prod_char,
                                   parenthesize=lambda set: set.is_Union or
                                   set.is_Intersection or set.is_ProductSet)