<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def pop_cell(self, idy=None, idx=None, tags=False):
 """Pops a cell, default the last of the last row"""

        idy = idy if idy is not None else len(self.body) - 1
        idx = idx if idx is not None else len(self.body[idy]) - 1
        cell = self.body[idy].pop(idx)
        return cell if tags else cell.childs[0]