lsst.afw.typehandling._GenericMap.AutoKeyMeta Class Reference

Inheritance diagram for lsst.afw.typehandling._GenericMap.AutoKeyMeta:

Public Member Functions
def	__call__ (cls, *args, **kwargs)

Detailed Description

A metaclass for abstract mappings whose key type is implied by their
constructor arguments.

This metaclass requires that the mapping have a `dict`-like constructor,
i.e., it takes a mapping or an iterable of key-value pairs as its first
positional parameter.

This class differs from `~lsst.utils.TemplateMeta` only in that the dtype
(or equivalent) constructor keyword is optional. If it is omitted, the
class will attempt to infer it from the first argument.

Definition at line 122 of file _GenericMap.py.

Member Function Documentation

__call__()

def lsst.afw.typehandling._GenericMap.AutoKeyMeta.__call__	(		cls,
		*	args,
		**	kwargs
	)

Definition at line 135 of file _GenericMap.py.

    def __call__(cls, *args, **kwargs):  # noqa N805, non-self first param
        if len(cls.TEMPLATE_PARAMS) != 1:
            raise ValueError("AutoKeyMeta requires exactly one template parameter")
        dtypeKey = cls.TEMPLATE_PARAMS[0]
        dtype = kwargs.get(dtypeKey, None)
 
        # Try to infer dtype if not provided
        if dtype is None and len(args) >= 1:
            dtype = cls._guessKeyType(args[0])
            if dtype is not None:
                kwargs[dtypeKey] = dtype
 
        return super().__call__(*args, **kwargs)
 

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The documentation for this class was generated from the following file:

• /j/snowflake/release/lsstsw/stack/lsst-scipipe-0.7.0/Linux64/afw/22.0.1-42-gca6935d93+ba5e5ca3eb/python/lsst/afw/typehandling/_GenericMap.py