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def_concatenate_chunks(chunks: list[dict[int, ArrayLike]]) ->dict:
""" Concatenate chunks of data read with low_memory=True. The tricky part is handling Categoricals, where different chunks may have different inferred categories. """names=list(chunks[0].keys())
warning_columns= []
result: dict= {}
fornameinnames:
arrs= [chunk.pop(name) forchunkinchunks]
# Check each arr for consistent types.dtypes= {a.dtypeforainarrs}
non_cat_dtypes= {xforxindtypesifnotisinstance(x, CategoricalDtype)}
dtype=dtypes.pop()
ifisinstance(dtype, CategoricalDtype):
result[name] =union_categoricals(arrs, sort_categories=False)
else:
result[name] =concat_compat(arrs)
iflen(non_cat_dtypes) >1andresult[name].dtype==np.dtype(object):
warning_columns.append(str(name))
ifwarning_columns:
warning_names=",".join(warning_columns)
warning_message=" ".join(
[
f"Columns ({warning_names}) have mixed types. "f"Specify dtype option on import or set low_memory=False."
]
)
warnings.warn(warning_message, DtypeWarning, stacklevel=find_stack_level())
returnresult```
### Alternative SolutionsReplacecolumnsnumberwithcolumnnames### Additional Context_Noresponse_
The text was updated successfully, but these errors were encountered:
Feature Type
Adding new functionality to pandas
Changing existing functionality in pandas
Removing existing functionality in pandas
Problem Description
The current DtypeWarning message:
DtypeWarning: Columns (15,19) have mixed types. Specify dtype option on import or set low_memory=False.
Having a column name more than a column number would make sense.
Preferred warning message:
DtypeWarning: Columns (15: Comment, 19: Description) have mixed types. Specify dtype option on import or set low_memory=False.
DtypeWarning: Columns (15, 19) have mixed types. Specify dtype option ({'Comment': str, 'Description': str}) on import or set low_memory=False.
So the next user action can be easy:
Feature Description
Current code:
The text was updated successfully, but these errors were encountered: