group.py 文件源码

python
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项目:h5pyd 作者: HDFGroup 项目源码 文件源码
def require_dataset(self, name, shape, dtype, exact=False, **kwds):
        """ Open a dataset, creating it if it doesn't exist.

        If keyword "exact" is False (default), an existing dataset must have
        the same shape and a conversion-compatible dtype to be returned.  If
        True, the shape and dtype must match exactly.

        Other dataset keywords (see create_dataset) may be provided, but are
        only used if a new dataset is to be created.

        Raises TypeError if an incompatible object already exists, or if the
        shape or dtype don't match according to the above rules.
        """

        with phil:
            if not name in self:
                return self.create_dataset(name, *(shape, dtype), **kwds)

            dset = self[name]
            if not isinstance(dset, Dataset):
                raise TypeError("Incompatible object (%s) already exists" % dset.__class__.__name__)

            if not shape == dset.shape:
                raise TypeError("Shapes do not match (existing %s vs new %s)" % (dset.shape, shape))

            if exact:
                if not dtype == dset.dtype:
                    raise TypeError("Datatypes do not exactly match (existing %s vs new %s)" % (dset.dtype, dtype))
            elif not numpy.can_cast(dtype, dset.dtype):
                raise TypeError("Datatypes cannot be safely cast (existing %s vs new %s)" % (dset.dtype, dtype))

            return dset
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