def __getitem__(self, key):
if key not in self.src:
raise errors.invalid_key_error(self, key)
if key in self.dst:
return self.dst[key]
else:
value = self.src[key]
self.dst.save_item(key, value)
return value
def __getitem__(self, key):
for d in self._datasets:
if key in d:
return d[key]
raise errors.invalid_key_error(self, key)
def __delitem__(self, key):
self._assert_writable('Cannot delete item from unwritable dataset')
if key in self._keys:
del self._base[key]
else:
raise errors.invalid_key_error(self, key)
def __setitem__(self, key, value):
self._assert_writable('Cannot set item for unwritable dataset')
if key in self._keys:
self._base[key] = value
else:
raise errors.invalid_key_error(self, key)
def __getitem__(self, key):
self._assert_open('Cannot get item from closed dataset')
if key not in self._keys:
raise errors.invalid_key_error(self, key)
return self._base[key]