Regression: None in string input is wrongly cast to the "None" string · Issue #21083 · pandas-dev/pandas (original) (raw)

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Description

In Pandas 0.22.0:

df = pd.DataFrame({'data': ['x', None]}, dtype=str) df['data'].tolist() ['x', None]

In Pandas 0.23.0:

df = pd.DataFrame({'data': ['x', None]}, dtype=str) df['data'].tolist() ['x', 'None']

pd.show_versions()

INSTALLED VERSIONS

commit: None python: 3.6.5.final.0 python-bits: 64 OS: Linux OS-release: 4.15.0-20-generic machine: x86_64 processor: x86_64 byteorder: little LC_ALL: None LANG: fr_FR.UTF-8 LOCALE: fr_FR.UTF-8

pandas: 0.23.0 pytest: 3.3.2 pip: 10.0.1 setuptools: 38.4.0 Cython: 0.28.2 numpy: 1.14.2 scipy: None pyarrow: 0.9.1.dev14+g6599ab0.d20180323 xarray: None IPython: 6.2.1 sphinx: 1.6.7 patsy: None dateutil: 2.6.1 pytz: 2017.3 blosc: None bottleneck: None tables: None numexpr: None feather: None matplotlib: 2.1.2 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