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pandas.MultiIndex.set_levels does not accept generator #23273

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AntoineD opened this issue Oct 22, 2018 · 2 comments

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commented Oct 22, 2018

Code Sample, a copy-pastable example if possible

index = pd.MultiIndex.from_tuples(((0,1), (0, 2)))
index.set_levels(map(int, (3,)), level=0)

Problem description

Raises

TypeError: 'map' object is not subscriptable

Workaround by wrapping map with list.

Expected Output

MultiIndex(levels=[[3], [1, 2]],
labels=[[0, 0], [0, 1]])

Output of pd.show_versions()

INSTALLED VERSIONS ------------------ commit: None python: 3.6.6.final.0 python-bits: 64 OS: Linux OS-release: 4.18.14-200.fc28.x86_64 machine: x86_64 processor: x86_64 byteorder: little LC_ALL: en_US.UTF-8 LANG: en_US.UTF-8 LOCALE: en_US.UTF-8

pandas: 0.23.4
pytest: 3.8.2
pip: 10.0.1
setuptools: 40.4.3
Cython: None
numpy: 1.15.2
scipy: 1.1.0
pyarrow: None
xarray: None
IPython: 7.0.1
sphinx: 1.8.1
patsy: None
dateutil: 2.7.3
pytz: 2018.5
blosc: None
bottleneck: None
tables: None
numexpr: None
feather: None
matplotlib: 2.2.2
openpyxl: None
xlrd: None
xlwt: None
xlsxwriter: None
lxml: None
bs4: None
html5lib: None
sqlalchemy: None
pymysql: None
psycopg2: None
jinja2: 2.10
s3fs: None
fastparquet: None
pandas_gbq: None
pandas_datareader: None

@TomAugspurger

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commented Oct 22, 2018

It's documented to accept a sequence, which needs to implement __getitem__. We would probably take a PR that turns the iterable into a list.

@AntoineD

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commented Oct 25, 2018

Thanks a lot. 👍

thoo added a commit to thoo/pandas that referenced this issue Oct 27, 2018

Merge remote-tracking branch 'repo_org/master' into Warning_prefix_pa…
…ndas

* repo_org/master: (23 commits)
  DOC: Add docstring validations for "See Also" section (pandas-dev#23143)
  TST: Fix test assertion (pandas-dev#23357)
  BUG: Handle Period in combine (pandas-dev#23350)
  REF: SparseArray imports (pandas-dev#23329)
  CI: Migrate some CircleCI jobs to Azure (pandas-dev#22992)
  DOC: update the is_month_start/is_month_end docstring (pandas-dev#23051)
  Partialy fix issue pandas-dev#23334 - isort pandas/core/groupby directory (pandas-dev#23341)
  TST: Add base test for extensionarray setitem pandas-dev#23300 (pandas-dev#23304)
  API: Add sparse Acessor (pandas-dev#23183)
  PERF: speed up CategoricalIndex.get_loc (pandas-dev#23235)
  fix and test incorrect case in delta_to_nanoseconds (pandas-dev#23302)
  BUG: Handle Datetimelike data in DataFrame.combine (pandas-dev#23317)
  TST: re-enable gbq tests (pandas-dev#23303)
  Switched references of App veyor to azure pipelines in the contributing CI section (pandas-dev#23311)
  isort imports-io (pandas-dev#23332)
  DOC: Added a Multi Index example for the Series.sum method (pandas-dev#23279)
  REF: Make PeriodArray an ExtensionArray (pandas-dev#22862)
  DOC: Added Examples for Series max (pandas-dev#23298)
  API/ENH: tz_localize handling of nonexistent times: rename keyword + add shift option (pandas-dev#22644)
  BUG: Let MultiIndex.set_levels accept any iterable (pandas-dev#23273) (pandas-dev#23291)
  ...

thoo added a commit to thoo/pandas that referenced this issue Oct 27, 2018

Merge remote-tracking branch 'repo_org/master' into check_np_pd_fromE…
…xamples

* repo_org/master: (83 commits)
  DOC: Add docstring validations for "See Also" section (pandas-dev#23143)
  TST: Fix test assertion (pandas-dev#23357)
  BUG: Handle Period in combine (pandas-dev#23350)
  REF: SparseArray imports (pandas-dev#23329)
  CI: Migrate some CircleCI jobs to Azure (pandas-dev#22992)
  DOC: update the is_month_start/is_month_end docstring (pandas-dev#23051)
  Partialy fix issue pandas-dev#23334 - isort pandas/core/groupby directory (pandas-dev#23341)
  TST: Add base test for extensionarray setitem pandas-dev#23300 (pandas-dev#23304)
  API: Add sparse Acessor (pandas-dev#23183)
  PERF: speed up CategoricalIndex.get_loc (pandas-dev#23235)
  fix and test incorrect case in delta_to_nanoseconds (pandas-dev#23302)
  BUG: Handle Datetimelike data in DataFrame.combine (pandas-dev#23317)
  TST: re-enable gbq tests (pandas-dev#23303)
  Switched references of App veyor to azure pipelines in the contributing CI section (pandas-dev#23311)
  isort imports-io (pandas-dev#23332)
  DOC: Added a Multi Index example for the Series.sum method (pandas-dev#23279)
  REF: Make PeriodArray an ExtensionArray (pandas-dev#22862)
  DOC: Added Examples for Series max (pandas-dev#23298)
  API/ENH: tz_localize handling of nonexistent times: rename keyword + add shift option (pandas-dev#22644)
  BUG: Let MultiIndex.set_levels accept any iterable (pandas-dev#23273) (pandas-dev#23291)
  ...
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