iloc boolean mask setitem · Issue #20438 · pandas-dev/pandas (original) (raw)

ValueError Traceback (most recent call last) in () 1 x = pd.Series([0, 1, 2]) ----> 2 x.iloc[[True, False, True]] = [1, 2]

~/sandbox/pandas-ip/pandas/pandas/core/indexing.py in setitem(self, key, value) 185 key = com._apply_if_callable(key, self.obj) 186 indexer = self._get_setitem_indexer(key) --> 187 self._setitem_with_indexer(indexer, value) 188 189 def _has_valid_type(self, k, axis):

~/sandbox/pandas-ip/pandas/pandas/core/indexing.py in _setitem_with_indexer(self, indexer, value) 636 self.obj._consolidate_inplace() 637 self.obj._data = self.obj._data.setitem(indexer=indexer, --> 638 value=value) 639 self.obj._maybe_update_cacher(clear=True) 640

~/sandbox/pandas-ip/pandas/pandas/core/internals.py in setitem(self, **kwargs) 3646 3647 def setitem(self, **kwargs): -> 3648 return self.apply('setitem', **kwargs) 3649 3650 def putmask(self, **kwargs):

~/sandbox/pandas-ip/pandas/pandas/core/internals.py in apply(self, f, axes, filter, do_integrity_check, consolidate, **kwargs) 3534 3535 kwargs['mgr'] = self -> 3536 applied = getattr(b, f)(**kwargs) 3537 result_blocks = _extend_blocks(applied, result_blocks) 3538

~/sandbox/pandas-ip/pandas/pandas/core/internals.py in setitem(self, indexer, value, mgr) 883 indexer.dtype == np.bool_ and 884 len(indexer[indexer]) == len(value)): --> 885 raise ValueError("cannot set using a list-like indexer " 886 "with a different length than the value") 887

ValueError: cannot set using a list-like indexer with a different length than the value

But __setitem__ and .loc support setting via that.