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Showing content from https://github.com/pandas-dev/pandas/issues/25464 below:

Incorrect TypeError for CategoricalIndex.view('i8') · Issue #25464 · pandas-dev/pandas · GitHub

xref #25447 (comment)

import pandas.util.testing as tm
ind = tm.makeCategoricalIndex(100)
ind.view('i8')

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-11-5cb1f6f042dd> in <module>()
      1 import pandas.util.testing as tm
      2 ind = tm.makeCategoricalIndex(100)
----> 3 ind.view('i8')

~\Anaconda3\lib\site-packages\pandas\core\indexes\base.py in view(self, cls)
    913         # index type here
    914         if cls is not None and not hasattr(cls, '_typ'):
--> 915             result = self._data.view(cls)
    916         else:
    917             result = self._shallow_copy()

TypeError: view() takes 1 positional argument but 2 were given

TypeError: Cannot change data-type for object array

commit: None
python: 3.6.5.final.0
python-bits: 64
OS: Windows
OS-release: 10
machine: AMD64
processor: Intel64 Family 6 Model 69 Stepping 1, GenuineIntel
byteorder: little
LC_ALL: None
LANG: None
LOCALE: None.None

pandas: 0.23.0
pytest: 3.5.1
pip: 10.0.1
setuptools: 39.1.0
Cython: 0.28.2
numpy: 1.14.3
scipy: 1.1.0
pyarrow: None
xarray: None
IPython: 6.4.0
sphinx: 1.7.4
patsy: 0.5.0
dateutil: 2.7.3
pytz: 2018.4
blosc: None
bottleneck: 1.2.1
tables: 3.4.3
numexpr: 2.6.5
feather: None
matplotlib: 2.2.2
openpyxl: 2.5.3
xlrd: 1.1.0
xlwt: 1.3.0
xlsxwriter: 1.0.4
lxml: 4.2.1
bs4: 4.6.0
html5lib: 1.0.1
sqlalchemy: 1.2.7
pymysql: None
psycopg2: None
jinja2: 2.10
s3fs: None
fastparquet: None
pandas_gbq: None
pandas_datareader: None

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