def retrieve_asset(self, sid, default_none=False):
"""
Retrieve the Asset object of a given sid.
"""
if isinstance(sid, Asset):
return sid
try:
asset = self._asset_cache[sid]
except KeyError:
asset_type = self.asset_type_by_sid(sid)
if asset_type == 'equity':
asset = self._retrieve_equity(sid)
elif asset_type == 'future':
asset = self._retrieve_futures_contract(sid)
else:
asset = None
# Cache the asset if it has been retrieved
if asset is not None:
self._asset_cache[sid] = asset
if asset is not None:
return asset
elif default_none:
return None
else:
raise SidNotFound(sid=sid)
def retrieve_asset(self, sid, default_none=False):
if isinstance(sid, Asset):
return sid
asset = self.cache.get(sid)
if asset is not None:
return asset
elif default_none:
return None
else:
raise SidNotFound(sid=sid)
def lookup_generic(self,
asset_convertible_or_iterable,
as_of_date):
"""
Convert a AssetConvertible or iterable of AssetConvertibles into
a list of Asset objects.
This method exists primarily as a convenience for implementing
user-facing APIs that can handle multiple kinds of input. It should
not be used for internal code where we already know the expected types
of our inputs.
Returns a pair of objects, the first of which is the result of the
conversion, and the second of which is a list containing any values
that couldn't be resolved.
"""
matches = []
missing = []
# Interpret input as scalar.
if isinstance(asset_convertible_or_iterable, AssetConvertible):
self._lookup_generic_scalar(
asset_convertible=asset_convertible_or_iterable,
as_of_date=as_of_date,
matches=matches,
missing=missing,
)
try:
return matches[0], missing
except IndexError:
if hasattr(asset_convertible_or_iterable, '__int__'):
raise SidNotFound(sid=asset_convertible_or_iterable)
else:
raise SymbolNotFound(symbol=asset_convertible_or_iterable)
# Interpret input as iterable.
try:
iterator = iter(asset_convertible_or_iterable)
except TypeError:
raise NotAssetConvertible(
"Input was not a AssetConvertible "
"or iterable of AssetConvertible."
)
for obj in iterator:
self._lookup_generic_scalar(obj, as_of_date, matches, missing)
return matches, missing
def retrieve_asset(self, sid, default_none=False):
if isinstance(sid, Asset):
return sid
try:
asset = self._asset_cache[sid]
except KeyError:
asset_type = self.asset_type_by_sid(sid)
if asset_type == 'equity':
asset = self._retrieve_equity(sid)
elif asset_type == 'future':
asset = self._retrieve_futures_contract(sid)
else:
asset = None
self._asset_cache[sid] = asset
if asset is not None:
return asset
elif default_none:
return None
else:
raise SidNotFound(sid=sid)