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[BUG] Modify concatenate_columns ignore_empty output #1166

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1 change: 1 addition & 0 deletions AUTHORS.md
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Expand Up @@ -112,3 +112,4 @@ Contributors
- [@asmirnov69](https://github.com/asmirnov69) | [contributions](https://github.com/pyjanitor-devs/pyjanitor/issues?q=is%3Aclosed+mentions%asmirnov69)
- [@xujiboy](https://github.com/xujiboy) | [contributions](https://github.com/pyjanitor-devs/pyjanitor/issues?q=is%3Aclosed+mentions%xujiboy)
- [@joranbeasley](https://github.com/joranbeasley) | [contributions](https://github.com/pyjanitor-devs/pyjanitor/issues?q=is%3Aclosed+mentions%joranbeasley)
- [@Fu-Jie](https://github.com/Fu-Jie) | [contributions](https://github.com/pyjanitor-devs/pyjanitor/pulls?q=is%3Aclosed+mentions%3AFu-Jie)
1 change: 1 addition & 0 deletions CHANGELOG.md
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Expand Up @@ -5,6 +5,7 @@
- [INF] Replace `pytest.ini` file with `pyproject.toml` file. PR #1204 @Zeroto521
- [INF] Extract docstrings tests from all tests. PR #1205 @Zeroto521
- [BUG] address the `TypeError` when importing v0.24.0 (issue #1201 @xujiboy and @joranbeasley)
- [BUG] Modify ignore_empty output in `concatenate_columns`. Issue #1164 @Fu-Jie

## [v0.24.0] - 2022-11-12

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3 changes: 2 additions & 1 deletion janitor/functions/concatenate_columns.py
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Expand Up @@ -51,8 +51,9 @@ def concatenate_columns(
if len(column_names) < 2:
raise JanitorError("At least two columns must be specified")

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df = df.copy() # avoid mutating original data
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df[new_column_name] = (
df[column_names].astype(str).fillna("").agg(sep.join, axis=1)
df[column_names].astype("string").fillna("").agg(sep.join, axis=1)
)

if ignore_empty:
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2 changes: 1 addition & 1 deletion tests/functions/test_concatenate_columns.py
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Expand Up @@ -28,7 +28,7 @@ def test_concatenate_columns_null_values(missingdata_df):
new_column_name="index",
ignore_empty=True,
)
expected_values = ["1.0-1", "2.0-2", "nan-3"] * 3
expected_values = ["1.0-1", "2.0-2", "3"] * 3
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Please also update the docstrings for the test.

assert expected_values == df["index"].tolist()


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I also think it might be worth writing a test merging a custom dataframe with a float column (NaN), a datetime column (NaT) and a string column (None/NA?).

And assert the expected output accordingly.

Then, mention this PR or the attached issue in the test docstring as well, please.

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