How to use the satpy.channel.GenericChannel.__init__ function in satpy

def __init__(self, filename=None):
        satpy.channel.GenericChannel.__init__(self)
        self._md = {}
        self._projectables = []
        self._keys = []
        self._refs = {}
        self.shape = None
        if filename:
            self.read(filename)

def __init__(self):
        satpy.channel.GenericChannel.__init__(self, "CloudType")
        self.region = None
        self.des = ""
        self.cloudtype_des = ""
        self.qualityflag_des = ""
        self.phaseflag_des = ""
        self.sec_1970 = 0
        self.satellite_id = ""
        self.cloudtype_lut = []
        self.qualityflag_lut = []
        self.phaseflag_lut = []
        self.cloudtype = None
        self.qualityflag = None
        self.phaseflag = None

def __init__(self):
        satpy.channel.GenericChannel.__init__(self, "CloudType")
        self.filled = False
        self.name = "CloudType"
        self.package = ""
        self.saf = ""
        self.product_name = ""
        self.num_of_columns = 0
        self.num_of_lines = 0
        self.projection_name = ""
        self.pcs_def = ""
        self.xscale = 0
        self.yscale = 0
        self.ll_lon = 0.0
        self.ll_lat = 0.0
        self.ur_lon = 0.0
        self.ur_lat = 0.0
        self.region_name = ""

def __init__(self, prodname, resolution=None):
        satpy.channel.GenericChannel.__init__(self, prodname)
        self.filled = False
        self.name = prodname
        self.resolution = resolution

        self.info = {}
        self._eoshdf_info = {}
        self.shape = None
        self.satid = ""
        self.orbit = None
        self.attr = None

        #self.scanline_attrs = {}
        self.data = None

        self.starttime = None
        self.endtime = None

def __init__(self, filename=None):
        satpy.channel.GenericChannel.__init__(self)
        self.mda = {}
        self._projectables = []
        self._keys = []
        self._refs = {}
        self.shape = None
        if filename:
            self.read(filename)

def __init__(self):
        satpy.channel.GenericChannel.__init__(self, "PC")
        self.filled = False
        self.name = "PC"
        self.package = ""
        self.saf = ""
        self.product_name = ""
        self.num_of_columns = 0
        self.num_of_lines = 0
        self.projection_name = ""
        self.pcs_def = ""
        self.xscale = 0
        self.yscale = 0
        self.ll_lon = 0.0
        self.ll_lat = 0.0
        self.ur_lon = 0.0
        self.ur_lat = 0.0
        self.region_name = ""

def __init__(self,
                 name=None,
                 resolution=0,
                 wavelength_range=[-np.inf, -np.inf, -np.inf],
                 data=None,
                 calibration_unit=None):

        GenericChannel.__init__(self, name)

        self._data = None
        self.wavelength_range = None

        if(name is None and
           wavelength_range == [-np.inf, -np.inf, -np.inf]):
            raise ValueError("Cannot define a channel with neither name "
                             "nor wavelength range.")

        if not isinstance(resolution, (int, float)):
            raise TypeError("Resolution must be an integer number of meters.")

        self.resolution = resolution

        if(not isinstance(wavelength_range, (tuple, list, set)) or
           len(wavelength_range) != 3 or

def __init__(self, filename=None):
        satpy.channel.GenericChannel.__init__(self)
        self._md = {}
        self._projectables = []
        self._keys = []
        self._refs = {}
        self.shape = None
        if filename:
            self.read(filename)