How to use the flopy.pakbase.Package.__init__ function in flopy

nu=0.025, zeta=[], ssz=[], isource=0,
                 extension=['swi', 'zta'],
                 fname_output='swi.zta', unitnumber=None):
        """
        Package constructor.

        """
        # set default unit number of one is not specified
        if unitnumber is None:
            unitnumber = ModflowSwi.defaultunit()

        name = [ModflowSwi.ftype(), 'DATA(BINARY)']
        extra = ['', 'REPLACE']

        # Call ancestor's init to set self.parent
        Package.__init__(self, model, extension, name, unitnumber, extra=extra)

        nrow, ncol, nlay, nper = self.parent.nrow_ncol_nlay_nper
        line = '# Salt Water Intrusion package file for MODFLOW-2000, generated by Flopy.'
        self.heading = line
        self.npln = npln
        self.istrat = istrat
        self.iswizt = iswizt
        self.nprn = nprn
        self.toeslope = toeslope
        self.tipslope = tipslope
        self.zetamin = zetamin
        self.delzeta = delzeta
        # Create arrays so that they have the correct size
        if self.istrat == 1:
            self.nu = Util2d(model, (self.npln + 1,), np.float32, nu,
                             name='nu')

# set filenames
        if filenames is None:
            filenames = [None]
        elif isinstance(filenames, str):
            filenames = [filenames]

        # Fill namefile items
        name = [ModflowChd.ftype()]
        units = [unitnumber]
        extra = ['']

        # set package name
        fname = [filenames[0]]

        # Call ancestor's init to set self.parent, extension, name and unit number
        Package.__init__(self, model, extension=extension, name=name,
                         unit_number=units, extra=extra, filenames=fname)

        self.url = 'chd.htm'
        self.heading = '# {} package for '.format(self.name[0]) + \
                       ' {}, '.format(model.version_types[model.version]) + \
                       'generated by Flopy.'

        if dtype is not None:
            self.dtype = dtype
        else:
            self.dtype = self.get_default_dtype(
                structured=self.parent.structured)
        self.stress_period_data = MfList(self, stress_period_data)

        self.np = 0
        if options is None:

fname = filenames[1]
            model.add_output_file(ipakcb, fname=fname,
                                  package=ModflowEvt.ftype())
        else:
            ipakcb = 0

        # Fill namefile items
        name = [ModflowEvt.ftype()]
        units = [unitnumber]
        extra = ['']

        # set package name
        fname = [filenames[0]]

        # Call ancestor's init to set self.parent, extension, name and unit number
        Package.__init__(self, model, extension=extension, name=name,
                         unit_number=units, extra=extra, filenames=fname)

        nrow, ncol, nlay, nper = self.parent.nrow_ncol_nlay_nper
        self.heading = '# {} package for '.format(self.name[0]) + \
                       ' {}, '.format(model.version_types[model.version]) + \
                       'generated by Flopy.'
        self.url = 'evt.htm'
        self.nevtop = nevtop
        self.ipakcb = ipakcb
        self.external = external
        if self.external is False:
            load = True
        else:
            load = model.load

        self.surf = Transient2d(model, (nrow, ncol), np.float32,

# set filenames
        if filenames is None:
            filenames = [None]
        elif isinstance(filenames, str):
            filenames = [filenames]

        # Fill namefile items
        name = [ModflowMlt.ftype()]
        units = [unitnumber]
        extra = ['']

        # set package name
        fname = [filenames[0]]

        # Call ancestor's init to set self.parent, extension, name and unit number
        Package.__init__(self, model, extension=extension, name=name,
                         unit_number=units, extra=extra, filenames=fname)

        self.heading = '# {} package for '.format(self.name[0]) + \
                       ' {}, '.format(model.version_types[model.version]) + \
                       'generated by Flopy.'
        self.url = 'mult.htm'

        self.nml = 0
        if mult_dict is not None:
            self.nml = len(mult_dict)
            self.mult_dict = mult_dict
            # print mult_dict
        self.parent.add_package(self)

# set filenames
        if filenames is None:
            filenames = [None]
        elif isinstance(filenames, str):
            filenames = [filenames]

        # Fill namefile items
        name = [Mt3dDsp.ftype()]
        units = [unitnumber]
        extra = ['']

        # set package name
        fname = [filenames[0]]

        # Call ancestor's init to set self.parent, extension, name and unit number
        Package.__init__(self, model, extension=extension, name=name,
                         unit_number=units, extra=extra, filenames=fname)

        nrow = model.nrow
        ncol = model.ncol
        nlay = model.nlay
        ncomp = model.ncomp
        mcomp = model.mcomp
        self.multiDiff = multiDiff
        self.al = Util3d(model, (nlay, nrow, ncol), np.float32, al, name='al',
                         locat=self.unit_number[0],
                         array_free_format=False)
        self.trpt = Util2d(model, (nlay,), np.float32, trpt, name='trpt',
                           locat=self.unit_number[0],
                           array_free_format=False)
        self.trpv = Util2d(model, (nlay,), np.float32, trpv, name='trpv',
                           locat=self.unit_number[0],

def __init__(self, model, nstrm=2, nss=1, nsfrpar=0, nparseg=0, const=128390.4, dleak=0.0001, istcb1=50, istcb2=66,
                 isfropt=0,
                 nstrail=10, isuzn=1, nsfrsets=30, irtflg=1, numtim=2, weight=0.75, flwtol=0.0001,
                 reach_data=None,
                 segment_data=None,
                 channel_geometry_data=None,
                 channel_flow_data=None,
                 dataset_5=None,
                 reachinput=False, transroute=False,
                 tabfiles=False, tabfiles_dict=None,
                 extension='sfr', unitnumber=17):

        """
        Package constructor
        """
        Package.__init__(self, model, extension, 'SFR',
                         unitnumber)  # Call ancestor's init to set self.parent, extension, name, and unit number

        self.url = 'sfr2.htm'
        self.nper = self.parent.nrow_ncol_nlay_nper[-1]
        self.nper = 1 if self.nper == 0 else self.nper  # otherwise iterations from 0, nper won't run

        # Dataset 0 -----------------------------------------------------------------------
        self.heading = '# SFR2 for MODFLOW, generated by Flopy.'

        # Dataset 1a and 1b. -----------------------------------------------------------------------
        self.reachinput = reachinput
        self.transroute = transroute
        self.tabfiles = tabfiles
        self.tabfiles_dict = tabfiles_dict
        self.numtab = 0 if not tabfiles else len(tabfiles_dict)
        self.maxval = np.max([tb['numval'] for tb in tabfiles_dict.values()]) if self.numtab > 0 else 0

if filenames is None:
            filenames = [None]
        elif isinstance(filenames, str):
            filenames = [filenames]

        # Fill namefile items
        name = [ModflowSip.ftype()]
        units = [unitnumber]
        extra = ['']

        # set package name
        fname = [filenames[0]]

        # Call ancestor's init to set self.parent, extension, name and
        # unit number
        Package.__init__(self, model, extension=extension, name=name,
                         unit_number=units, extra=extra, filenames=fname)

        # check if a valid model version has been specified
        if model.version == 'mfusg':
            err = 'Error: cannot use {} package '.format(self.name) + \
                  'with model version {}'.format(model.version)
            raise Exception(err)

        self.heading = '# {} package for '.format(self.name[0]) + \
                       ' {}, '.format(model.version_types[model.version]) + \
                       'generated by Flopy.'
        self.url = 'sip.htm'

        self.mxiter = mxiter
        self.nparm = nparm
        self.accl = accl

model.add_output_file(iswiobs, fname=fname, binflag=binflag,
                                  extension=ext, package=ModflowSwi2.ftype())
        else:
            iswiobs = 0

        # Fill namefile items
        name = [ModflowSwi2.ftype()]
        units = [unitnumber]
        extra = ['']

        # set package name
        fname = [filenames[0]]

        # Call ancestor's init to set self.parent, extension, name and
        # unit number
        Package.__init__(self, model, extension=extension, name=name,
                         unit_number=units, extra=extra, filenames=fname)

        nrow, ncol, nlay, nper = self.parent.nrow_ncol_nlay_nper
        self.heading = '# {} package for '.format(self.name[0]) + \
                       ' {}, '.format(model.version_types[model.version]) + \
                       'generated by Flopy.'

        # options
        self.fsssopt, self.adaptive = False, False
        if isinstance(options, list):
            if len(options) < 1:
                self.options = None
            else:
                self.options = options
                for o in self.options:
                    if o.lower() == 'fsssopt':

fname = filenames[idx+3]
                model.add_output_file(iu, fname=fname, extension=ext,
                                      package=ModflowSub.ftype())
                idx += 1

        extensions = [extension]
        name = [ModflowSub.ftype()]
        units = [unitnumber]
        extra = ['']

        # set package name
        fname = [filenames[0]]

        # Call ancestor's init to set self.parent, extension, name and
        # unit number
        Package.__init__(self, model, extension=extensions, name=name,
                         unit_number=units, extra=extra, filenames=fname)

        nrow, ncol, nlay, nper = self.parent.nrow_ncol_nlay_nper

        self.heading = '# {} package for '.format(self.name[0]) + \
                       ' {}, '.format(model.version_types[model.version]) + \
                       'generated by Flopy.'
        self.url = 'sub.htm'

        self.ipakcb = ipakcb
        self.isuboc = isuboc
        self.idsave = idsave
        self.idrest = idrest
        self.idbit = idbit
        self.nndb = nndb
        self.ndb = ndb