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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 setLogEntries(self, entries, save=True, update_policies=True):
 """Sets list of log entries. If save=True, saves the log. If update_policies=True, also updates default policies based on these entries"""

        prev = None;  # "previous" valid entry for "Prev" link
        uplink = os.path.join("..", Purr.RenderIndex.INDEX);  # "Up" link
        self.entries = []
        for entry in entries:
            if not entry.ignore:
                entry.setPrevUpNextLinks(prev=prev, up=uplink)
                prev = entry
                self.entries.append(entry)
        if save:
            self.save()
        if update_policies:
            # populate default policies and renames based on entry list
            self._default_dp_props = {}
            for entry in entries:
                self.updatePoliciesFromEntry(entry)
            dprint(4, "default policies:", self._default_dp_props)