def __init__(self, lat_min, lat_max, lon_min, lon_max, start=None, end=None):
        self._lat_min = float(lat_min)
        self._lat_max = float(lat_max)
        self._lon_min = float(lon_min)
        self._lon_max = float(lon_max)

        if start:
            self._start = start
        else:
            self._start = None

        if end:
            self._end = end
        else:
            self._end = None
Default Bounds constructor
dataset/ETHPy150Open apache/climate/ocw/dataset.py/Bounds.__init__