Using config files

Simple-Parsing can use default values from one or more configuration files.

The config_path argument can be passed to the ArgumentParser constructor. The values read from that file will overwrite the default values from the dataclass definitions.

Additionally, when the add_config_path_arg argument of the ArgumentParser constructor is set, a --config_path argument will be added to the parser. This argument accepts one or more paths to configuration files, whose contents will be read, and used to update the defaults, in the same manner as with the config_path argument above.

When using both options (the config_path parameter of ArgumentParser.__init__, as well as the --config_path command-line argument), the defaults are first updated using ArgumentParser.config_path, and then updated with the contents of the --config_path file(s).

In other words, the default values are set like so, in increasing priority:

normal defaults (e.g. from the dataclass definitions)
updated with the contents of the config_path file(s) of ArgumentParser.__init__
updated with the contents of the --config_path file(s) from the command-line.

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