| Description: | This is an abstract role which provides an alternate constructor for
creating objects using parameters passed in from a configuration file. The
actual implementation of reading the configuration file is left to concrete
subroles.
It declares an attribute 'configfile' and a class method 'new_with_config',
and requires that concrete roles derived from it implement the class method
'get_config_from_file'.
Attributes specified directly as arguments to 'new_with_config' supercede
those in the configfile. |
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