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BUG: to_xml with index=False and offset input index #42464

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merged 2 commits into from
Jul 12, 2021
Merged

BUG: to_xml with index=False and offset input index #42464

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170ca23
BUG: `to_xml` with `index=False` and offset input index
stephan-hesselmann-by Jul 9, 2021
374c78c
Address review comments
stephan-hesselmann-by Jul 12, 2021
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1 change: 1 addition & 0 deletions doc/source/whatsnew/v1.3.1.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,7 @@ Fixed regressions
Bug fixes
~~~~~~~~~
- Fixed bug in :meth:`DataFrame.transpose` dropping values when the DataFrame had an Extension Array dtype and a duplicate index (:issue:`42380`)
- Fixed bug in :meth:`DataFrame.to_xml` raising ``KeyError`` when called with ``index=False`` and an offset index (:issue:`42458`)
-

.. ---------------------------------------------------------------------------
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16 changes: 9 additions & 7 deletions pandas/io/formats/xml.py
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Expand Up @@ -195,14 +195,16 @@ def handle_indexes(self) -> None:
This method will add indexes into attr_cols or elem_cols.
"""

indexes: list[str] = [
x for x in self.frame_dicts[0].keys() if x not in self.orig_cols
]
if not self.index:
return

first_dict = next(iter(self.frame_dicts.values()))
indexes: list[str] = [x for x in first_dict.keys() if x not in self.orig_cols]

if self.attr_cols and self.index:
if self.attr_cols:
self.attr_cols = indexes + self.attr_cols

if self.elem_cols and self.index:
if self.elem_cols:
self.elem_cols = indexes + self.elem_cols

def get_prefix_uri(self) -> str:
Expand Down Expand Up @@ -307,7 +309,7 @@ def build_tree(self) -> bytes:
self.elem_row = SubElement(self.root, f"{self.prefix_uri}{self.row_name}")

if not self.attr_cols and not self.elem_cols:
self.elem_cols = list(self.frame_dicts[0].keys())
self.elem_cols = list(d.keys())
self.build_elems()

else:
Expand Down Expand Up @@ -477,7 +479,7 @@ def build_tree(self) -> bytes:
self.elem_row = SubElement(self.root, f"{self.prefix_uri}{self.row_name}")

if not self.attr_cols and not self.elem_cols:
self.elem_cols = list(self.frame_dicts[0].keys())
self.elem_cols = list(d.keys())
self.build_elems()

else:
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41 changes: 40 additions & 1 deletion pandas/tests/io/xml/test_to_xml.py
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Expand Up @@ -11,7 +11,10 @@

import pandas.util._test_decorators as td

from pandas import DataFrame
from pandas import (
DataFrame,
RangeIndex,
)
import pandas._testing as tm

from pandas.io.common import get_handle
Expand Down Expand Up @@ -290,6 +293,42 @@ def test_index_false_rename_row_root(datapath, parser):
assert output == expected


def test_index_false_with_offset_input_index(parser):
"""
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Not sure we annotate reason for test even on bug fixes.

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I can remove the docstring if it goes against coding guidelines for the project. But personally I like to give context to tests like these.

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we normally don't add this, just a comment to the issue. but no harm as you have written it.

Tests that the output does not contain the `<index>` field when the index of the
input Dataframe has an offset.

This is a regression test for issue #42458.
"""

expected = """\
<?xml version='1.0' encoding='utf-8'?>
<data>
<row>
<shape>square</shape>
<degrees>360</degrees>
<sides>4.0</sides>
</row>
<row>
<shape>circle</shape>
<degrees>360</degrees>
<sides/>
</row>
<row>
<shape>triangle</shape>
<degrees>180</degrees>
<sides>3.0</sides>
</row>
</data>"""

offset_geom_df = geom_df.copy()
offset_geom_df.index = RangeIndex(start=10, stop=13, step=1)
output = offset_geom_df.to_xml(index=False, parser=parser)
output = equalize_decl(output)

assert output == expected


# NA_REP

na_expected = """\
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