from datetime import datetime
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import re
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import numpy as np
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import pytest
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from pandas import (
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Index,
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MultiIndex,
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Series,
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)
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import pandas._testing as tm
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class TestRename:
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def test_rename(self, datetime_series):
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ts = datetime_series
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renamer = lambda x: x.strftime("%Y%m%d")
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renamed = ts.rename(renamer)
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assert renamed.index[0] == renamer(ts.index[0])
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# dict
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rename_dict = dict(zip(ts.index, renamed.index))
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renamed2 = ts.rename(rename_dict)
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tm.assert_series_equal(renamed, renamed2)
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def test_rename_partial_dict(self):
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# partial dict
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ser = Series(np.arange(4), index=["a", "b", "c", "d"], dtype="int64")
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renamed = ser.rename({"b": "foo", "d": "bar"})
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tm.assert_index_equal(renamed.index, Index(["a", "foo", "c", "bar"]))
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def test_rename_retain_index_name(self):
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# index with name
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renamer = Series(
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np.arange(4), index=Index(["a", "b", "c", "d"], name="name"), dtype="int64"
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)
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renamed = renamer.rename({})
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assert renamed.index.name == renamer.index.name
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def test_rename_by_series(self):
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ser = Series(range(5), name="foo")
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renamer = Series({1: 10, 2: 20})
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result = ser.rename(renamer)
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expected = Series(range(5), index=[0, 10, 20, 3, 4], name="foo")
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tm.assert_series_equal(result, expected)
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def test_rename_set_name(self):
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ser = Series(range(4), index=list("abcd"))
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for name in ["foo", 123, 123.0, datetime(2001, 11, 11), ("foo",)]:
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result = ser.rename(name)
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assert result.name == name
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tm.assert_numpy_array_equal(result.index.values, ser.index.values)
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assert ser.name is None
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def test_rename_set_name_inplace(self):
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ser = Series(range(3), index=list("abc"))
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for name in ["foo", 123, 123.0, datetime(2001, 11, 11), ("foo",)]:
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ser.rename(name, inplace=True)
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assert ser.name == name
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exp = np.array(["a", "b", "c"], dtype=np.object_)
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tm.assert_numpy_array_equal(ser.index.values, exp)
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def test_rename_axis_supported(self):
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# Supporting axis for compatibility, detailed in GH-18589
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ser = Series(range(5))
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ser.rename({}, axis=0)
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ser.rename({}, axis="index")
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with pytest.raises(ValueError, match="No axis named 5"):
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ser.rename({}, axis=5)
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def test_rename_inplace(self, datetime_series):
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renamer = lambda x: x.strftime("%Y%m%d")
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expected = renamer(datetime_series.index[0])
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datetime_series.rename(renamer, inplace=True)
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assert datetime_series.index[0] == expected
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def test_rename_with_custom_indexer(self):
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# GH 27814
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class MyIndexer:
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pass
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ix = MyIndexer()
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ser = Series([1, 2, 3]).rename(ix)
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assert ser.name is ix
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def test_rename_with_custom_indexer_inplace(self):
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# GH 27814
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class MyIndexer:
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pass
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ix = MyIndexer()
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ser = Series([1, 2, 3])
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ser.rename(ix, inplace=True)
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assert ser.name is ix
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def test_rename_callable(self):
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# GH 17407
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ser = Series(range(1, 6), index=Index(range(2, 7), name="IntIndex"))
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result = ser.rename(str)
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expected = ser.rename(lambda i: str(i))
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tm.assert_series_equal(result, expected)
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assert result.name == expected.name
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def test_rename_none(self):
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# GH 40977
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ser = Series([1, 2], name="foo")
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result = ser.rename(None)
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expected = Series([1, 2])
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tm.assert_series_equal(result, expected)
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def test_rename_series_with_multiindex(self):
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# issue #43659
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arrays = [
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["bar", "baz", "baz", "foo", "qux"],
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["one", "one", "two", "two", "one"],
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]
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index = MultiIndex.from_arrays(arrays, names=["first", "second"])
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ser = Series(np.ones(5), index=index)
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result = ser.rename(index={"one": "yes"}, level="second", errors="raise")
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arrays_expected = [
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["bar", "baz", "baz", "foo", "qux"],
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["yes", "yes", "two", "two", "yes"],
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]
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index_expected = MultiIndex.from_arrays(
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arrays_expected, names=["first", "second"]
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)
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series_expected = Series(np.ones(5), index=index_expected)
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tm.assert_series_equal(result, series_expected)
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def test_rename_series_with_multiindex_keeps_ea_dtypes(self):
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# GH21055
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arrays = [
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Index([1, 2, 3], dtype="Int64").astype("category"),
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Index([1, 2, 3], dtype="Int64"),
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]
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mi = MultiIndex.from_arrays(arrays, names=["A", "B"])
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ser = Series(1, index=mi)
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result = ser.rename({1: 4}, level=1)
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arrays_expected = [
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Index([1, 2, 3], dtype="Int64").astype("category"),
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Index([4, 2, 3], dtype="Int64"),
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]
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mi_expected = MultiIndex.from_arrays(arrays_expected, names=["A", "B"])
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expected = Series(1, index=mi_expected)
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tm.assert_series_equal(result, expected)
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def test_rename_error_arg(self):
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# GH 46889
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ser = Series(["foo", "bar"])
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match = re.escape("[2] not found in axis")
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with pytest.raises(KeyError, match=match):
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ser.rename({2: 9}, errors="raise")
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def test_rename_copy_false(self, using_copy_on_write):
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# GH 46889
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ser = Series(["foo", "bar"])
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ser_orig = ser.copy()
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shallow_copy = ser.rename({1: 9}, copy=False)
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ser[0] = "foobar"
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if using_copy_on_write:
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assert ser_orig[0] == shallow_copy[0]
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assert ser_orig[1] == shallow_copy[9]
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else:
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assert ser[0] == shallow_copy[0]
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assert ser[1] == shallow_copy[9]
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