flopy.mf6.modflow.mfgwflak module¶

class ModflowGwflak(model, loading_package=False, auxiliary=None, boundnames=None, print_input=None, print_stage=None, print_flows=None, save_flows=None, stage_filerecord=None, budget_filerecord=None, package_convergence_filerecord=None, timeseries=None, observations=None, mover=None, surfdep=None, time_conversion=None, length_conversion=None, nlakes=None, noutlets=None, ntables=None, packagedata=None, connectiondata=None, tables=None, outlets=None, perioddata=None, filename=None, pname=None, parent_file=None)[source]¶

Bases: flopy.mf6.mfpackage.MFPackage

ModflowGwflak defines a lak package within a gwf6 model.

Parameters:

model (MFModel) – Model that this package is a part of. Package is automatically added to model when it is initialized.
loading_package (bool) – Do not set this parameter. It is intended for debugging and internal processing purposes only.
auxiliary ([string]) –
- auxiliary (string) defines an array of one or more auxiliary variable names. There is no limit on the number of auxiliary variables that can be provided on this line; however, lists of information provided in subsequent blocks must have a column of data for each auxiliary variable name defined here. The number of auxiliary variables detected on this line determines the value for naux. Comments cannot be provided anywhere on this line as they will be interpreted as auxiliary variable names. Auxiliary variables may not be used by the package, but they will be available for use by other parts of the program. The program will terminate with an error if auxiliary variables are specified on more than one line in the options block.
boundnames (boolean) –
- boundnames (boolean) keyword to indicate that boundary names may be provided with the list of lake cells.
print_input (boolean) –
- print_input (boolean) keyword to indicate that the list of lake information will be written to the listing file immediately after it is read.
print_stage (boolean) –
- print_stage (boolean) keyword to indicate that the list of lake stages will be printed to the listing file for every stress period in which “HEAD PRINT” is specified in Output Control. If there is no Output Control option and PRINT_STAGE is specified, then stages are printed for the last time step of each stress period.
print_flows (boolean) –
- print_flows (boolean) keyword to indicate that the list of lake flow rates will be printed to the listing file for every stress period time step in which “BUDGET PRINT” is specified in Output Control. If there is no Output Control option and “PRINT_FLOWS” is specified, then flow rates are printed for the last time step of each stress period.
save_flows (boolean) –
- save_flows (boolean) keyword to indicate that lake flow terms will be written to the file specified with “BUDGET FILEOUT” in Output Control.
stage_filerecord ([stagefile]) –
- stagefile (string) name of the binary output file to write stage information.
budget_filerecord ([budgetfile]) –
- budgetfile (string) name of the binary output file to write budget information.
package_convergence_filerecord ([package_convergence_filename]) –
- package_convergence_filename (string) name of the comma spaced values output file to write package convergence information.
timeseries ({varname:data} or timeseries data) –
- Contains data for the ts package. Data can be stored in a dictionary containing data for the ts package with variable names as keys and package data as values. Data just for the timeseries variable is also acceptable. See ts package documentation for more information.
observations ({varname:data} or continuous data) –
- Contains data for the obs package. Data can be stored in a dictionary containing data for the obs package with variable names as keys and package data as values. Data just for the observations variable is also acceptable. See obs package documentation for more information.
mover (boolean) –
- mover (boolean) keyword to indicate that this instance of the LAK Package can be used with the Water Mover (MVR) Package. When the MOVER option is specified, additional memory is allocated within the package to store the available, provided, and received water.
surfdep (double) –
- surfdep (double) real value that defines the surface depression depth for VERTICAL lake-GWF connections. If specified, SURFDEP must be greater than or equal to zero. If SURFDEP is not specified, a default value of zero is used for all vertical lake-GWF connections.
time_conversion (double) –
- time_conversion (double) value that is used in converting outlet flow terms that use Manning’s equation or gravitational acceleration to consistent time units. TIME_CONVERSION should be set to 1.0, 60.0, 3,600.0, 86,400.0, and 31,557,600.0 when using time units (TIME_UNITS) of seconds, minutes, hours, days, or years in the simulation, respectively. CONVTIME does not need to be specified if no lake outlets are specified or TIME_UNITS are seconds.
length_conversion (double) –
- length_conversion (double) real value that is used in converting outlet flow terms that use Manning’s equation or gravitational acceleration to consistent length units. LENGTH_CONVERSION should be set to 3.28081, 1.0, and 100.0 when using length units (LENGTH_UNITS) of feet, meters, or centimeters in the simulation, respectively. LENGTH_CONVERSION does not need to be specified if no lake outlets are specified or LENGTH_UNITS are meters.
nlakes (integer) –
- nlakes (integer) value specifying the number of lakes that will be simulated for all stress periods.
noutlets (integer) –
- noutlets (integer) value specifying the number of outlets that will be simulated for all stress periods. If NOUTLETS is not specified, a default value of zero is used.
ntables (integer) –
- ntables (integer) value specifying the number of lakes tables that will be used to define the lake stage, volume relation, and surface area. If NTABLES is not specified, a default value of zero is used.
packagedata ([lakeno, strt, nlakeconn, aux, boundname]) –
- lakeno (integer) integer value that defines the lake number associated with the specified PACKAGEDATA data on the line. LAKENO must be greater than zero and less than or equal to NLAKES. Lake information must be specified for every lake or the program will terminate with an error. The program will also terminate with an error if information for a lake is specified more than once. This argument is an index variable, which means that it should be treated as zero-based when working with FloPy and Python. Flopy will automatically subtract one when loading index variables and add one when writing index variables.
- strt (double) real value that defines the starting stage for the lake.
- nlakeconn (integer) integer value that defines the number of GWF cells connected to this (LAKENO) lake. There can only be one vertical lake connection to each GWF cell. NLAKECONN must be greater than zero.
- aux (double) represents the values of the auxiliary variables for each lake. The values of auxiliary variables must be present for each lake. The values must be specified in the order of the auxiliary variables specified in the OPTIONS block. If the package supports time series and the Options block includes a TIMESERIESFILE entry (see the “Time-Variable Input” section), values can be obtained from a time series by entering the time-series name in place of a numeric value.
- boundname (string) name of the lake cell. BOUNDNAME is an ASCII character variable that can contain as many as 40 characters. If BOUNDNAME contains spaces in it, then the entire name must be enclosed within single quotes.
connectiondata ([lakeno, iconn, cellid, claktype, bedleak, belev, telev,) –
connlen, connwidth]
- lakeno (integer) integer value that defines the lake number associated with the specified CONNECTIONDATA data on the line. LAKENO must be greater than zero and less than or equal to NLAKES. Lake connection information must be specified for every lake connection to the GWF model (NLAKECONN) or the program will terminate with an error. The program will also terminate with an error if connection information for a lake connection to the GWF model is specified more than once. This argument is an index variable, which means that it should be treated as zero-based when working with FloPy and Python. Flopy will automatically subtract one when loading index variables and add one when writing index variables.
- iconn (integer) integer value that defines the GWF connection number for this lake connection entry. ICONN must be greater than zero and less than or equal to NLAKECONN for lake LAKENO. This argument is an index variable, which means that it should be treated as zero-based when working with FloPy and Python. Flopy will automatically subtract one when loading index variables and add one when writing index variables.
- cellid ((integer, …)) is the cell identifier, and depends on the type of grid that is used for the simulation. For a structured grid that uses the DIS input file, CELLID is the layer, row, and column. For a grid that uses the DISV input file, CELLID is the layer and CELL2D number. If the model uses the unstructured discretization (DISU) input file, CELLID is the node number for the cell. This argument is an index variable, which means that it should be treated as zero-based when working with FloPy and Python. Flopy will automatically subtract one when loading index variables and add one when writing index variables.
- claktype (string) character string that defines the lake-GWF connection type for the lake connection. Possible lake-GWF connection type strings include: VERTICAL–character keyword to indicate the lake-GWF connection is vertical and connection conductance calculations use the hydraulic conductivity corresponding to the \(K_{33}\) tensor component defined for CELLID in the NPF package. HORIZONTAL–character keyword to indicate the lake-GWF connection is horizontal and connection conductance calculations use the hydraulic conductivity corresponding to the \(K_{11}\) tensor component defined for CELLID in the NPF package. EMBEDDEDH–character keyword to indicate the lake-GWF connection is embedded in a single cell and connection conductance calculations use the hydraulic conductivity corresponding to the \(K_{11}\) tensor component defined for CELLID in the NPF package. EMBEDDEDV–character keyword to indicate the lake-GWF connection is embedded in a single cell and connection conductance calculations use the hydraulic conductivity corresponding to the \(K_{33}\) tensor component defined for CELLID in the NPF package. Embedded lakes can only be connected to a single cell (NLAKECONN = 1) and there must be a lake table associated with each embedded lake.
- bedleak (double) character string or real value that defines the bed leakance for the lake-GWF connection. BEDLEAK must be greater than or equal to zero or specified to be NONE. If BEDLEAK is specified to be NONE, the lake-GWF connection conductance is solely a function of aquifer properties in the connected GWF cell and lakebed sediments are assumed to be absent.
- belev (double) real value that defines the bottom elevation for a HORIZONTAL lake-GWF connection. Any value can be specified if CLAKTYPE is VERTICAL, EMBEDDEDH, or EMBEDDEDV. If CLAKTYPE is HORIZONTAL and BELEV is not equal to TELEV, BELEV must be greater than or equal to the bottom of the GWF cell CELLID. If BELEV is equal to TELEV, BELEV is reset to the bottom of the GWF cell CELLID.
- telev (double) real value that defines the top elevation for a HORIZONTAL lake-GWF connection. Any value can be specified if CLAKTYPE is VERTICAL, EMBEDDEDH, or EMBEDDEDV. If CLAKTYPE is HORIZONTAL and TELEV is not equal to BELEV, TELEV must be less than or equal to the top of the GWF cell CELLID. If TELEV is equal to BELEV, TELEV is reset to the top of the GWF cell CELLID.
- connlen (double) real value that defines the distance between the connected GWF CELLID node and the lake for a HORIZONTAL, EMBEDDEDH, or EMBEDDEDV lake-GWF connection. CONLENN must be greater than zero for a HORIZONTAL, EMBEDDEDH, or EMBEDDEDV lake-GWF connection. Any value can be specified if CLAKTYPE is VERTICAL.
- connwidth (double) real value that defines the connection face width for a HORIZONTAL lake-GWF connection. CONNWIDTH must be greater than zero for a HORIZONTAL lake-GWF connection. Any value can be specified if CLAKTYPE is VERTICAL, EMBEDDEDH, or EMBEDDEDV.
tables ([lakeno, tab6_filename]) –
- lakeno (integer) integer value that defines the lake number associated with the specified TABLES data on the line. LAKENO must be greater than zero and less than or equal to NLAKES. The program will terminate with an error if table information for a lake is specified more than once or the number of specified tables is less than NTABLES. This argument is an index variable, which means that it should be treated as zero-based when working with FloPy and Python. Flopy will automatically subtract one when loading index variables and add one when writing index variables.
- tab6_filename (string) character string that defines the path and filename for the file containing lake table data for the lake connection. The TAB6_FILENAME file includes the number of entries in the file and the relation between stage, volume, and surface area for each entry in the file. Lake table files for EMBEDDEDH and EMBEDDEDV lake-GWF connections also include lake-GWF exchange area data for each entry in the file. Instructions for creating the TAB6_FILENAME input file are provided in Lake Table Input File section.
outlets ([outletno, lakein, lakeout, couttype, invert, width, rough,) –
slope]
- outletno (integer) integer value that defines the outlet number associated with the specified OUTLETS data on the line. OUTLETNO must be greater than zero and less than or equal to NOUTLETS. Outlet information must be specified for every outlet or the program will terminate with an error. The program will also terminate with an error if information for a outlet is specified more than once. This argument is an index variable, which means that it should be treated as zero-based when working with FloPy and Python. Flopy will automatically subtract one when loading index variables and add one when writing index variables.
- lakein (integer) integer value that defines the lake number that outlet is connected to. LAKEIN must be greater than zero and less than or equal to NLAKES. This argument is an index variable, which means that it should be treated as zero-based when working with FloPy and Python. Flopy will automatically subtract one when loading index variables and add one when writing index variables.
- lakeout (integer) integer value that defines the lake number that outlet discharge from lake outlet OUTLETNO is routed to. LAKEOUT must be greater than or equal to zero and less than or equal to NLAKES. If LAKEOUT is zero, outlet discharge from lake outlet OUTLETNO is discharged to an external boundary. This argument is an index variable, which means that it should be treated as zero-based when working with FloPy and Python. Flopy will automatically subtract one when loading index variables and add one when writing index variables.
- couttype (string) character string that defines the outlet type for the outlet OUTLETNO. Possible COUTTYPE strings include: SPECIFIED– character keyword to indicate the outlet is defined as a specified flow. MANNING–character keyword to indicate the outlet is defined using Manning’s equation. WEIR–character keyword to indicate the outlet is defined using a sharp weir equation.
- invert (double) real value that defines the invert elevation for the lake outlet. Any value can be specified if COUTTYPE is SPECIFIED. If the Options block includes a TIMESERIESFILE entry (see the “Time- Variable Input” section), values can be obtained from a time series by entering the time-series name in place of a numeric value.
- width (double) real value that defines the width of the lake outlet. Any value can be specified if COUTTYPE is SPECIFIED. If the Options block includes a TIMESERIESFILE entry (see the “Time-Variable Input” section), values can be obtained from a time series by entering the time-series name in place of a numeric value.
- rough (double) real value that defines the roughness coefficient for the lake outlet. Any value can be specified if COUTTYPE is not MANNING. If the Options block includes a TIMESERIESFILE entry (see the “Time-Variable Input” section), values can be obtained from a time series by entering the time-series name in place of a numeric value.
- slope (double) real value that defines the bed slope for the lake outlet. Any value can be specified if COUTTYPE is not MANNING. If the Options block includes a TIMESERIESFILE entry (see the “Time-Variable Input” section), values can be obtained from a time series by entering the time-series name in place of a numeric value.
perioddata ([number, laksetting]) –
- number (integer) integer value that defines the lake or outlet number associated with the specified PERIOD data on the line. NUMBER must be greater than zero and less than or equal to NLAKES for a lake number and less than or equal to NOUTLETS for an outlet number. This argument is an index variable, which means that it should be treated as zero-based when working with FloPy and Python. Flopy will automatically subtract one when loading index variables and add one when writing index variables.
- laksetting (keystring) line of information that is parsed into a keyword and values. Keyword values that can be used to start the LAKSETTING string include both keywords for lake settings and keywords for outlet settings. Keywords for lake settings include: STATUS, STAGE, RAINFALL, EVAPORATION, RUNOFF, INFLOW, WITHDRAWAL, and AUXILIARY. Keywords for outlet settings include RATE, INVERT, WIDTH, SLOPE, and ROUGH.
  status : [string]
  
  status (string) keyword option to define lake status. STATUS can be ACTIVE, INACTIVE, or CONSTANT. By default, STATUS is ACTIVE.
  
  stage : [string]
  
  stage (string) real or character value that defines the stage for the lake. The specified STAGE is only applied if the lake is a constant stage lake. If the Options block includes a TIMESERIESFILE entry (see the “Time-Variable Input” section), values can be obtained from a time series by entering the time-series name in place of a numeric value.
  
  rainfall : [string]
  
  rainfall (string) real or character value that defines the rainfall rate \((LT^{-1})\) for the lake. Value must be greater than or equal to zero. If the Options block includes a TIMESERIESFILE entry (see the “Time-Variable Input” section), values can be obtained from a time series by entering the time-series name in place of a numeric value.
  
  evaporation : [string]
  
  evaporation (string) real or character value that defines the maximum evaporation rate \((LT^{-1})\) for the lake. Value must be greater than or equal to zero. If the Options block includes a TIMESERIESFILE entry (see the “Time-Variable Input” section), values can be obtained from a time series by entering the time-series name in place of a numeric value.
  
  runoff : [string]
  
  runoff (string) real or character value that defines the runoff rate \((L^3 T^{-1})\) for the lake. Value must be greater than or equal to zero. If the Options block includes a TIMESERIESFILE entry (see the “Time-Variable Input” section), values can be obtained from a time series by entering the time-series name in place of a numeric value.
  
  inflow : [string]
  
  inflow (string) real or character value that defines the volumetric inflow rate \((L^3 T^{-1})\) for the lake. Value must be greater than or equal to zero. If the Options block includes a TIMESERIESFILE entry (see the “Time-Variable Input” section), values can be obtained from a time series by entering the time-series name in place of a numeric value. By default, inflow rates are zero for each lake.
  
  withdrawal : [string]
  
  withdrawal (string) real or character value that defines the maximum withdrawal rate \((L^3 T^{-1})\) for the lake. Value must be greater than or equal to zero. If the Options block includes a TIMESERIESFILE entry (see the “Time-Variable Input” section), values can be obtained from a time series by entering the time-series name in place of a numeric value.
  
  rate : [string]
  
  rate (string) real or character value that defines the extraction rate for the lake outflow. A positive value indicates inflow and a negative value indicates outflow from the lake. RATE only applies to active (IBOUND \(>\) 0) lakes. A specified RATE is only applied if COUTTYPE for the OUTLETNO is SPECIFIED. If the Options block includes a TIMESERIESFILE entry (see the “Time-Variable Input” section), values can be obtained from a time series by entering the time-series name in place of a numeric value. By default, the RATE for each SPECIFIED lake outlet is zero.
  
  invert : [string]
  
  invert (string) real or character value that defines the invert elevation for the lake outlet. A specified INVERT value is only used for active lakes if COUTTYPE for lake outlet OUTLETNO is not SPECIFIED. If the Options block includes a TIMESERIESFILE entry (see the “Time-Variable Input” section), values can be obtained from a time series by entering the time-series name in place of a numeric value.
  
  width : [string]
  
  width (string) real or character value that defines the width of the lake outlet. A specified WIDTH value is only used for active lakes if COUTTYPE for lake outlet OUTLETNO is not SPECIFIED. If the Options block includes a TIMESERIESFILE entry (see the “Time-Variable Input” section), values can be obtained from a time series by entering the time-series name in place of a numeric value.
  
  slope : [string]
  
  slope (string) real or character value that defines the bed slope for the lake outlet. A specified SLOPE value is only used for active lakes if COUTTYPE for lake outlet OUTLETNO is MANNING. If the Options block includes a TIMESERIESFILE entry (see the “Time-Variable Input” section), values can be obtained from a time series by entering the time-series name in place of a numeric value.
  
  rough : [string]
  
  rough (string) real value that defines the roughness coefficient for the lake outlet. Any value can be specified if COUTTYPE is not MANNING. If the Options block includes a TIMESERIESFILE entry (see the “Time-Variable Input” section), values can be obtained from a time series by entering the time-series name in place of a numeric value.
  
  auxiliaryrecord : [auxname, auxval]
  
  auxname (string) name for the auxiliary variable to be assigned AUXVAL. AUXNAME must match one of the auxiliary variable names defined in the OPTIONS block. If AUXNAME does not match one of the auxiliary variable names defined in the OPTIONS block the data are ignored.
  
  auxval (double) value for the auxiliary variable. If the Options block includes a TIMESERIESFILE entry (see the “Time- Variable Input” section), values can be obtained from a time series by entering the time-series name in place of a numeric value.
filename (String) – File name for this package.
pname (String) – Package name for this package.
parent_file (MFPackage) – Parent package file that references this package. Only needed for utility packages (mfutl*). For example, mfutllaktab package must have a mfgwflak package parent_file.

auxiliary = <flopy.mf6.data.mfdatautil.ListTemplateGenerator object>¶

budget_filerecord = <flopy.mf6.data.mfdatautil.ListTemplateGenerator object>¶

connectiondata = <flopy.mf6.data.mfdatautil.ListTemplateGenerator object>¶

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tab6 filein tab6_filename', 'shape (ntables)', 'reader urword'], ['block tables', 'name lakeno', 'type integer', 'shape', 'tagged false', 'in_record true', 'reader urword', 'numeric_index true'], ['block tables', 'name tab6', 'type keyword', 'shape', 'in_record true', 'reader urword', 'tagged true', 'optional false'], ['block tables', 'name filein', 'type keyword', 'shape', 'in_record true', 'reader urword', 'tagged true', 'optional false'], ['block tables', 'name tab6_filename', 'type string', 'preserve_case true', 'in_record true', 'reader urword', 'optional false', 'tagged false'], ['block outlets', 'name outlets', 'type recarray outletno lakein lakeout couttype invert width rough slope', 'shape (noutlets)', 'reader urword'], ['block outlets', 'name outletno', 'type integer', 'shape', 'tagged false', 'in_record true', 'reader urword', 'numeric_index true'], ['block outlets', 'name lakein', 'type integer', 'shape', 'tagged false', 'in_record true', 'reader urword', 'numeric_index true'], ['block outlets', 'name lakeout', 'type integer', 'shape', 'tagged false', 'in_record true', 'reader urword', 'numeric_index true'], ['block outlets', 'name couttype', 'type string', 'shape', 'tagged false', 'in_record true', 'reader urword'], ['block outlets', 'name invert', 'type double precision', 'shape', 'tagged false', 'in_record true', 'reader urword', 'time_series true'], ['block outlets', 'name width', 'type double precision', 'shape', 'tagged false', 'in_record true', 'reader urword', 'time_series true'], ['block outlets', 'name rough', 'type double precision', 'shape', 'tagged false', 'in_record true', 'reader urword', 'time_series true'], ['block outlets', 'name slope', 'type double precision', 'shape', 'tagged false', 'in_record true', 'reader urword', 'time_series true'], ['block period', 'name iper', 'type integer', 'block_variable True', 'in_record true', 'tagged false', 'shape', 'valid', 'reader urword', 'optional false'], ['block period', 'name perioddata', 'type recarray number laksetting', 'shape', 'reader urword'], ['block period', 'name number', 'type integer', 'shape', 'tagged false', 'in_record true', 'reader urword', 'numeric_index true'], ['block period', 'name laksetting', 'type keystring status stage rainfall evaporation runoff inflow withdrawal rate invert width slope rough auxiliaryrecord', 'shape', 'tagged false', 'in_record true', 'reader urword'], ['block period', 'name status', 'type string', 'shape', 'tagged true', 'in_record true', 'reader urword'], ['block period', 'name stage', 'type string', 'shape', 'tagged true', 'in_record true', 'time_series true', 'reader urword'], ['block period', 'name rainfall', 'type string', 'shape', 'tagged true', 'in_record true', 'reader urword', 'time_series true'], ['block period', 'name evaporation', 'type string', 'shape', 'tagged true', 'in_record true', 'reader urword', 'time_series true'], ['block period', 'name runoff', 'type string', 'shape', 'tagged true', 'in_record true', 'reader urword', 'time_series true'], ['block period', 'name inflow', 'type string', 'shape', 'tagged true', 'in_record true', 'reader urword', 'time_series true'], ['block period', 'name withdrawal', 'type string', 'shape', 'tagged true', 'in_record true', 'reader urword', 'time_series true'], ['block period', 'name rate', 'type string', 'shape', 'tagged true', 'in_record true', 'reader urword', 'time_series true'], ['block period', 'name invert', 'type string', 'shape', 'tagged true', 'in_record true', 'reader urword', 'time_series true'], ['block period', 'name rough', 'type string', 'shape', 'tagged true', 'in_record true', 'reader urword', 'time_series true'], ['block period', 'name width', 'type string', 'shape', 'tagged true', 'in_record true', 'reader urword', 'time_series true'], ['block period', 'name slope', 'type string', 'shape', 'tagged true', 'in_record true', 'reader urword', 'time_series true'], ['block period', 'name auxiliaryrecord', 'type record auxiliary auxname auxval', 'shape', 'tagged', 'in_record true', 'reader urword'], ['block period', 'name auxiliary', 'type keyword', 'shape', 'in_record true', 'reader urword'], ['block period', 'name auxname', 'type string', 'shape', 'tagged false', 'in_record true', 'reader urword'], ['block period', 'name auxval', 'type double precision', 'shape', 'tagged false', 'in_record true', 'reader urword', 'time_series true']]¶

dfn_file_name = 'gwf-lak.dfn'¶

obs_filerecord = <flopy.mf6.data.mfdatautil.ListTemplateGenerator object>¶

outlets = <flopy.mf6.data.mfdatautil.ListTemplateGenerator object>¶

package_abbr = 'gwflak'¶

package_convergence_filerecord = <flopy.mf6.data.mfdatautil.ListTemplateGenerator object>¶

packagedata = <flopy.mf6.data.mfdatautil.ListTemplateGenerator object>¶

perioddata = <flopy.mf6.data.mfdatautil.ListTemplateGenerator object>¶

stage_filerecord = <flopy.mf6.data.mfdatautil.ListTemplateGenerator object>¶

tables = <flopy.mf6.data.mfdatautil.ListTemplateGenerator object>¶

ts_filerecord = <flopy.mf6.data.mfdatautil.ListTemplateGenerator object>¶