Pandas version checks
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[X] I have confirmed this bug exists on the latest version of pandas.
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[X] I have confirmed this bug exists on the main branch of pandas.
Reproducible Example
import pandas as pd
df = pd.DataFrame([["a", "b"], ["c", "d"], ["e", "f"]], columns=["left", "right"])
df["record"] = df[["left", "right"]].to_records()
print(df)
Issue Description
Printing a dataframe or a series with a column that has a dtype of "numpy.record" causes TypeError exception.
For the example above:
>>> df.dtypes
left object
right object
record (numpy.record, [('index', '<i8'), ('left', 'O'...
dtype: object
And print
raises an exception with the following traceback:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python3.10/site-packages/pandas/core/frame.py", line 1064, in __repr__
return self.to_string(**repr_params)
File "/usr/local/lib/python3.10/site-packages/pandas/core/frame.py", line 1245, in to_string
return fmt.DataFrameRenderer(formatter).to_string(
File "/usr/local/lib/python3.10/site-packages/pandas/io/formats/format.py", line 1136, in to_string
string = string_formatter.to_string()
File "/usr/local/lib/python3.10/site-packages/pandas/io/formats/string.py", line 30, in to_string
text = self._get_string_representation()
File "/usr/local/lib/python3.10/site-packages/pandas/io/formats/string.py", line 45, in _get_string_representation
strcols = self._get_strcols()
File "/usr/local/lib/python3.10/site-packages/pandas/io/formats/string.py", line 36, in _get_strcols
strcols = self.fmt.get_strcols()
File "/usr/local/lib/python3.10/site-packages/pandas/io/formats/format.py", line 617, in get_strcols
strcols = self._get_strcols_without_index()
File "/usr/local/lib/python3.10/site-packages/pandas/io/formats/format.py", line 883, in _get_strcols_without_index
fmt_values = self.format_col(i)
File "/usr/local/lib/python3.10/site-packages/pandas/io/formats/format.py", line 897, in format_col
return format_array(
File "/usr/local/lib/python3.10/site-packages/pandas/io/formats/format.py", line 1328, in format_array
return fmt_obj.get_result()
File "/usr/local/lib/python3.10/site-packages/pandas/io/formats/format.py", line 1359, in get_result
fmt_values = self._format_strings()
File "/usr/local/lib/python3.10/site-packages/pandas/io/formats/format.py", line 1413, in _format_strings
& np.all(notna(vals), axis=tuple(range(1, len(vals.shape))))
File "/usr/local/lib/python3.10/site-packages/pandas/core/dtypes/missing.py", line 434, in notna
res = isna(obj)
File "/usr/local/lib/python3.10/site-packages/pandas/core/dtypes/missing.py", line 185, in isna
return _isna(obj)
File "/usr/local/lib/python3.10/site-packages/pandas/core/dtypes/missing.py", line 214, in _isna
return _isna_array(obj, inf_as_na=inf_as_na)
File "/usr/local/lib/python3.10/site-packages/pandas/core/dtypes/missing.py", line 304, in _isna_array
result = np.isnan(values)
TypeError: ufunc 'isnan' not supported for the input types, and the inputs could not be safely coerced to any supported types according to the casting rule ''safe''
Expected Behavior
Dataframe with "numpy.record" column displayed correctly, as like it has an object dtype
>>> # df["record"] = [x for x in df[["left", "right"]].to_records()] # this is rendered correctly
>>> print(df)
left right record
0 a b [0, a, b]
1 c d [1, c, d]
2 e f [2, e, f]
Installed Versions
Reproduces both with the current latest master commit (below) and the latest pypi release (ca60aab7340d9989d9428e11a51467658190bb6b)
Comment From: RaphSku
I gave that a check and I think the reason why the list comprehension is working and the other approach not is that in the former case we have dtype list and in the later case a dtype np.recarray. When having a look into pandas/core/dtypes/missing.py
, we see in line 172-173 an _isna_array
check where the obj
is given as is and in case of the list it is given to 188-189 where the list is casted to a numpy array but with a specified dtype of object
. Then in _isna_array
since for the np.recarray the dtype is not object, it will execute result = np.isnan(values)
, leading to the error you described.
Maybe someone else also wants to verify this.
Comment From: RaphSku
take