def get(self, key=None):
"""Execute and return the result of the computation *key*.
Only *key* and its dependencies are computed.
Parameters
----------
key : str, optional
If not provided, :attr:`default_key` is used.
Raises
------
ValueError
If `key` and :attr:`default_key` are both :obj:`None`.
"""
if key is None:
if self.default_key is not None:
key = self.default_key
else:
raise ValueError('no default reporting key set')
# Cull the graph, leaving only those needed to compute *key*
dsk, deps = cull(self.graph, key)
log.debug('Cull {} -> {} keys'.format(len(self.graph), len(dsk)))
try:
return dask_get(dsk, key)
except Exception as exc:
raise ComputationError from exc
def get(self, key=None):
"""Execute and return the result of the computation *key*.
Only *key* and its dependencies are computed.
Parameters
----------
key : str, optional
If not provided, :attr:`default_key` is used.
Raises
------
ValueError
If `key` and :attr:`default_key` are both :obj:`None`.
"""
if key is None:
if self.default_key is not None:
key = self.default_key
else:
raise ValueError('no default reporting key set')
# Cull the graph, leaving only those needed to compute *key*
dsk, deps = cull(self.graph, key)
log.debug('Cull {} -> {} keys'.format(len(self.graph), len(dsk)))
try:
# Protect 'config' dict, so that dask schedulers do not try to
# interpret its contents as further tasks. Workaround for
# https://github.com/dask/dask/issues/3523
dsk['config'] = dask.core.quote(dsk['config'])
except KeyError:
pass
try:
return dask_get(dsk, key)
except Exception as exc:
# Print the exception in case ComputationError.__str__ fails;
# workaround for https://github.com/iiasa/ixmp/issues/206
print(exc)
raise ComputationError from exc
