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Emit warning for missing labels in Multiindex.loc[[...]] (and more) #20770

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merged 13 commits into from
May 1, 2018
Merged

Emit warning for missing labels in Multiindex.loc[[...]] (and more) #20770

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9ec8270
API: emit warning to raise KeyError in the future for missing keys al…
toobaz Apr 19, 2018
9291c89
TST: Fix inconsistencies in tests for ix with missing labels
toobaz Apr 20, 2018
2e93eef
TST: fix inconsistent tests on Float64Index with missing keys
toobaz Apr 20, 2018
46101ab
BUG: fix SparseDataFrame._reindex_with_indexers
toobaz Apr 20, 2018
b4dbe37
ENH: Do not build the indexer twice
toobaz Apr 20, 2018
44200f3
Comments, docstrings, refactoring
toobaz Apr 21, 2018
df9e8e2
REF: simplify _validate_key
toobaz Apr 22, 2018
d035b52
TST: comments and skipif for broken warning catching
toobaz Apr 22, 2018
cc71fde
DOC: docstrings for _validate_key
toobaz Apr 27, 2018
786e403
TST: Remove unneeded skipifs
toobaz Apr 27, 2018
b936320
TST: refine filter for Panel warnings
toobaz Apr 27, 2018
48fb72e
TST: missing assert_produces_warning
toobaz Apr 27, 2018
c62973b
Cleanup
TomAugspurger May 1, 2018
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3 changes: 3 additions & 0 deletions doc/source/whatsnew/v0.23.0.txt
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Expand Up @@ -873,6 +873,7 @@ Deprecations
- The ``is_copy`` attribute is deprecated and will be removed in a future version (:issue:`18801`).
- ``IntervalIndex.from_intervals`` is deprecated in favor of the :class:`IntervalIndex` constructor (:issue:`19263`)
- ``DataFrame.from_items`` is deprecated. Use :func:`DataFrame.from_dict` instead, or ``DataFrame.from_dict(OrderedDict())`` if you wish to preserve the key order (:issue:`17320`, :issue:`17312`)
- Indexing a :class:`MultiIndex` or a :class:`FloatIndex` with a list containing some missing keys will now show a :class:`FutureWarning`, which is consistent with other types of indexes (:issue:`17758`).

- The ``broadcast`` parameter of ``.apply()`` is deprecated in favor of ``result_type='broadcast'`` (:issue:`18577`)
- The ``reduce`` parameter of ``.apply()`` is deprecated in favor of ``result_type='reduce'`` (:issue:`18577`)
Expand Down Expand Up @@ -1107,6 +1108,8 @@ Indexing
- :func:`Index.to_series` now accepts ``index`` and ``name`` kwargs (:issue:`18699`)
- :func:`DatetimeIndex.to_series` now accepts ``index`` and ``name`` kwargs (:issue:`18699`)
- Bug in indexing non-scalar value from ``Series`` having non-unique ``Index`` will return value flattened (:issue:`17610`)
- Bug in indexing with iterator containing only missing keys, which raised no error (:issue:`20748`)
- Fixed inconsistency in ``.ix`` between list and scalar keys when the index has integer dtype and does not include the desired keys (:issue:`20753`)
- Bug in ``__setitem__`` when indexing a :class:`DataFrame` with a 2-d boolean ndarray (:issue:`18582`)
- Bug in ``str.extractall`` when there were no matches empty :class:`Index` was returned instead of appropriate :class:`MultiIndex` (:issue:`19034`)
- Bug in :class:`IntervalIndex` where empty and purely NA data was constructed inconsistently depending on the construction method (:issue:`18421`)
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3 changes: 3 additions & 0 deletions pandas/core/indexes/base.py
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Expand Up @@ -4881,6 +4881,9 @@ def _ensure_index(index_like, copy=False):
if hasattr(index_like, 'name'):
return Index(index_like, name=index_like.name, copy=copy)

if is_iterator(index_like):
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I think this covers generators as well?

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sure

index_like = list(index_like)

# must check for exactly list here because of strict type
# check in clean_index_list
if isinstance(index_like, list):
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