5 examples of 'python pandas concatenate multiple columns' in Python

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def _concat(df, type):
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    if df is None:
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        df = pd.DataFrame(_object_blocks[type])
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    else:
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        _df = pd.DataFrame(_object_blocks[type])
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        df = pd.concat([df, _df], sort=True)
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    return df

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@pytest.mark.functions
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def test_deconcatenate_column_string_no_sep(dataframe):
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    with pytest.raises(ValueError):
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        df_orig = dataframe.concatenate_columns(
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            column_names=["a", "decorated-elephant"],
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            sep="-",
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            new_column_name="index",
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        )
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        df = df_orig.deconcatenate_column(
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            column_name="index", new_column_names=["A", "B"]
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        )

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def concat(self, l):
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    if not len(l):
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        return "NA"
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    return ";".join([str(i) for i in l])

813
def merge(old_cols, new_cols):
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    return old_cols + new_cols

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def _concat(self, *args, **kwargs):
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    if self._dask:
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        return da.concatenate(*args, **kwargs)
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    else:
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        return np.concatenate(*args, **kwargs)