fastoad.io.variable_io module

class fastoad.io.variable_io.VariableIO(data_source: Union[str, IO], formatter: Optional[fastoad.io.formatter.IVariableIOFormatter] = None)

Bases: object

Class for reading and writing variable values from/to file.

The file format is defined by the class provided as formatter argument.

Parameters

• data_source – the I/O stream, or a file path, used for reading or writing data

• formatter – a class that determines the file format to be used. Defaults to a VariableBasicXmlFormatter instance.

read(only: Optional[List[str]] = None, ignore: Optional[List[str]] = None) → fastoad.openmdao.variables.variable_list.VariableList

Reads variables from provided data source.

Elements of only and ignore can be real variable names or Unix-shell-style patterns. In any case, comparison is case-sensitive.

Parameters

• only – List of variable names that should be read. Other names will be ignored. If None, all variables will be read.

• ignore – List of variable names that should be ignored when reading.

Returns

an VariableList instance where outputs have been defined using provided source

write(variables: fastoad.openmdao.variables.variable_list.VariableList, only: Optional[List[str]] = None, ignore: Optional[List[str]] = None)

Writes variables from provided VariableList instance.

Elements of only and ignore can be real variable names or Unix-shell-style patterns. In any case, comparison is case-sensitive.

Parameters

• variables – a VariableList instance

• only – List of variable names that should be written. Other names will be ignored. If None, all variables will be written.

• ignore – List of variable names that should be ignored when writing

class fastoad.io.variable_io.DataFile(data_source: Optional[Union[str, IO, list]] = None, formatter: Optional[fastoad.io.formatter.IVariableIOFormatter] = None, load_data=True)

Bases: fastoad.openmdao.variables.variable_list.VariableList

Class for managing FAST-OAD data files.

Behaves like VariableList class but has load() and save() methods.

If variable list is specified for data_source, file_path will have to be set before using :method:`save`.

Parameters

• data_source – Can be the file path where data will be loaded and saved, or a list of Variable instances that will be used for initialization (or a VariableList instance).

• formatter – (ignored if data_source is not an I/O stream nor a file path) a class that determines the file format to be used. Defaults to FAST-OAD native format. See VariableIO for more information.

• load_data – (ignored if data_source is not an I/O stream nor a file path) if True, file is expected to exist and its content will be loaded at instantiation.

property file_path: str

Path of data file.

property formatter: fastoad.io.formatter.IVariableIOFormatter

Class that defines the file format.

load()

Loads file content.

save()

Saves current state of variables in file.

save_as(file_path: str, overwrite=False, formatter: Optional[fastoad.io.formatter.IVariableIOFormatter] = None)

Sets the associated file path as specified and saves current state of variables.

Parameters

• file_path –

• overwrite – if specified file already exists and overwrite is False, an error is triggered.

• formatter – a class that determines the file format to be used. Defaults to FAST-OAD native format. See VariableIO for more information.