def get_kstpkper(self):
        kstpkper = []
        for kstp, kper in self.kstpkper:
            kstpkper.append((kstp - 1, kper - 1))
        return kstpkper
Get a list of unique stress periods and time steps in the file
dataset/ETHPy150Open modflowpy/flopy/flopy/utils/datafile.py/LayerFile.get_kstpkper