<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def reindex(self, copy=True):
 """Reindex the summary statistics dataframe"""

        ret = deepcopy(self) if copy else self

        ret.stats = ret.stats.reindex(index=ret._idx, level=0)
        if ret.idx_depth == 2:
            ret.stats = ret.stats.reindex(index=ret._sub_idx, level=1)
        if ret.rows is not None:
            ret.stats = ret.stats.reindex(index=ret.rows, level=ret.idx_depth)

        ret.stats = ret.stats.reindex(columns=ret._headers, level=0)
        ret.stats = ret.stats.reindex(columns=ret._subheaders, level=1)
        ret.stats = ret.stats.reindex(columns=ret._describe_cols, level=2)

        if copy:
            return ret