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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def child_regions(self):
 """This generator generates the list of direct child regions."""

        start, end = self.get_range()
        block = self._trigger.next()
        ref_lvl = self.scope_level
        while block.blockNumber() <= end and block.isValid():
            lvl = TextBlockHelper.get_fold_lvl(block)
            trigger = TextBlockHelper.is_fold_trigger(block)
            if lvl == ref_lvl and trigger:
                yield FoldScope(block)
            block = block.next()