pandas.MultiIndex.set_levels does not accept generator

[AntoineD]

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]

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]

Thanks a lot. 👍