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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 trsm(self,B,trans='N'):
 r""" Solves a triangular system of equations with multiple righthand sides. Computes .. math:: B &:= L^{-1} B \text{ if trans is 'N'} B &:= L^{-T} B \text{ if trans is 'T'} """

        
        if trans=='N':
            cp.trsm(self._L0,B)
            pftrsm(self._V,self._L,self._B,B,trans='N')
        elif trans=='T':
            pftrsm(self._V,self._L,self._B,B,trans='T')
            cp.trsm(self._L0,B,trans='T')
        elif type(trans) is str:
            raise ValueError("trans must be 'N' or 'T'")
        else:
            raise TypeError("trans must be 'N' or 'T'")
        return