x.__class__ to type(x) (#29904)

pandas/tests/indexes/datetimelike.py

@@ -38,7 +38,7 @@ def test_str(self):
         idx.name = "foo"
         assert not "length={}".format(len(idx)) in str(idx)
         assert "'foo'" in str(idx)
-        assert idx.__class__.__name__ in str(idx)
+        assert type(idx).__name__ in str(idx)
 
         if hasattr(idx, "tz"):
             if idx.tz is not None:

pandas/tests/indexes/multi/test_missing.py

@@ -42,9 +42,9 @@ def test_fillna(idx):
                 values[1] = np.nan
 
             if isinstance(index, PeriodIndex):
-                idx = index.__class__(values, freq=index.freq)
+                idx = type(index)(values, freq=index.freq)
             else:
-                idx = index.__class__(values)
+                idx = type(index)(values)
 
             expected = np.array([False] * len(idx), dtype=bool)
             expected[1] = True
@@ -115,7 +115,7 @@ def test_hasnans_isnans(idx):
     values = index.values
     values[1] = np.nan
 
-    index = idx.__class__(values)
+    index = type(idx)(values)
 
     expected = np.array([False] * len(index), dtype=bool)
     expected[1] = True

pandas/tests/indexes/period/test_partial_slicing.py

@@ -123,7 +123,7 @@ def test_range_slice_outofbounds(self):
 
         for idx in [didx, pidx]:
             df = DataFrame(dict(units=[100 + i for i in range(10)]), index=idx)
-            empty = DataFrame(index=idx.__class__([], freq="D"), columns=["units"])
+            empty = DataFrame(index=type(idx)([], freq="D"), columns=["units"])
             empty["units"] = empty["units"].astype("int64")
 
             tm.assert_frame_equal(df["2013/09/01":"2013/09/30"], empty)

pandas/tests/indexes/test_base.py

@@ -752,7 +752,7 @@ def test_fancy(self):
     @pytest.mark.parametrize("dtype", [np.int_, np.bool_])
     def test_empty_fancy(self, index, dtype):
         empty_arr = np.array([], dtype=dtype)
-        empty_index = index.__class__([])
+        empty_index = type(index)([])
 
         assert index[[]].identical(empty_index)
         assert index[empty_arr].identical(empty_index)
@@ -762,7 +762,7 @@ def test_empty_fancy_raises(self, index):
         # pd.DatetimeIndex is excluded, because it overrides getitem and should
         # be tested separately.
         empty_farr = np.array([], dtype=np.float_)
-        empty_index = index.__class__([])
+        empty_index = type(index)([])
 
         assert index[[]].identical(empty_index)
         # np.ndarray only accepts ndarray of int & bool dtypes, so should Index
@@ -2446,8 +2446,8 @@ def test_copy_name(self):
         # GH12309
         index = self.create_index()
 
-        first = index.__class__(index, copy=True, name="mario")
-        second = first.__class__(first, copy=False)
+        first = type(index)(index, copy=True, name="mario")
+        second = type(first)(first, copy=False)
 
         # Even though "copy=False", we want a new object.
         assert first is not second

pandas/tests/reshape/test_concat.py

@@ -949,7 +949,7 @@ def test_append_preserve_index_name(self):
 
     all_indexes = indexes_can_append + indexes_cannot_append_with_other
 
-    @pytest.mark.parametrize("index", all_indexes, ids=lambda x: x.__class__.__name__)
+    @pytest.mark.parametrize("index", all_indexes, ids=lambda x: type(x).__name__)
     def test_append_same_columns_type(self, index):
         # GH18359
 
@@ -979,7 +979,7 @@ def test_append_same_columns_type(self, index):
     @pytest.mark.parametrize(
         "df_columns, series_index",
         combinations(indexes_can_append, r=2),
-        ids=lambda x: x.__class__.__name__,
+        ids=lambda x: type(x).__name__,
     )
     def test_append_different_columns_types(self, df_columns, series_index):
         # GH18359
@@ -1004,12 +1004,12 @@ def test_append_different_columns_types(self, df_columns, series_index):
         tm.assert_frame_equal(result, expected)
 
     @pytest.mark.parametrize(
-        "index_can_append", indexes_can_append, ids=lambda x: x.__class__.__name__
+        "index_can_append", indexes_can_append, ids=lambda x: type(x).__name__
     )
     @pytest.mark.parametrize(
         "index_cannot_append_with_other",
         indexes_cannot_append_with_other,
-        ids=lambda x: x.__class__.__name__,
+        ids=lambda x: type(x).__name__,
     )
     def test_append_different_columns_types_raises(
         self, index_can_append, index_cannot_append_with_other

pandas/tests/series/test_apply.py

@@ -92,7 +92,7 @@ def test_apply_box(self):
         s = pd.Series(vals)
         assert s.dtype == "datetime64[ns]"
         # boxed value must be Timestamp instance
-        res = s.apply(lambda x: "{0}_{1}_{2}".format(x.__class__.__name__, x.day, x.tz))
+        res = s.apply(lambda x: f"{type(x).__name__}_{x.day}_{x.tz}")
         exp = pd.Series(["Timestamp_1_None", "Timestamp_2_None"])
         tm.assert_series_equal(res, exp)
 
@@ -102,23 +102,23 @@ def test_apply_box(self):
         ]
         s = pd.Series(vals)
         assert s.dtype == "datetime64[ns, US/Eastern]"
-        res = s.apply(lambda x: "{0}_{1}_{2}".format(x.__class__.__name__, x.day, x.tz))
+        res = s.apply(lambda x: f"{type(x).__name__}_{x.day}_{x.tz}")
         exp = pd.Series(["Timestamp_1_US/Eastern", "Timestamp_2_US/Eastern"])
         tm.assert_series_equal(res, exp)
 
         # timedelta
         vals = [pd.Timedelta("1 days"), pd.Timedelta("2 days")]
         s = pd.Series(vals)
         assert s.dtype == "timedelta64[ns]"
-        res = s.apply(lambda x: "{0}_{1}".format(x.__class__.__name__, x.days))
+        res = s.apply(lambda x: f"{type(x).__name__}_{x.days}")
         exp = pd.Series(["Timedelta_1", "Timedelta_2"])
         tm.assert_series_equal(res, exp)
 
         # period
         vals = [pd.Period("2011-01-01", freq="M"), pd.Period("2011-01-02", freq="M")]
         s = pd.Series(vals)
         assert s.dtype == "Period[M]"
-        res = s.apply(lambda x: "{0}_{1}".format(x.__class__.__name__, x.freqstr))
+        res = s.apply(lambda x: f"{type(x).__name__}_{x.freqstr}")
         exp = pd.Series(["Period_M", "Period_M"])
         tm.assert_series_equal(res, exp)
 
@@ -614,7 +614,7 @@ def test_map_box(self):
         s = pd.Series(vals)
         assert s.dtype == "datetime64[ns]"
         # boxed value must be Timestamp instance
-        res = s.map(lambda x: "{0}_{1}_{2}".format(x.__class__.__name__, x.day, x.tz))
+        res = s.apply(lambda x: f"{type(x).__name__}_{x.day}_{x.tz}")
         exp = pd.Series(["Timestamp_1_None", "Timestamp_2_None"])
         tm.assert_series_equal(res, exp)
 
@@ -624,23 +624,23 @@ def test_map_box(self):
         ]
         s = pd.Series(vals)
         assert s.dtype == "datetime64[ns, US/Eastern]"
-        res = s.map(lambda x: "{0}_{1}_{2}".format(x.__class__.__name__, x.day, x.tz))
+        res = s.apply(lambda x: f"{type(x).__name__}_{x.day}_{x.tz}")
         exp = pd.Series(["Timestamp_1_US/Eastern", "Timestamp_2_US/Eastern"])
         tm.assert_series_equal(res, exp)
 
         # timedelta
         vals = [pd.Timedelta("1 days"), pd.Timedelta("2 days")]
         s = pd.Series(vals)
         assert s.dtype == "timedelta64[ns]"
-        res = s.map(lambda x: "{0}_{1}".format(x.__class__.__name__, x.days))
+        res = s.apply(lambda x: f"{type(x).__name__}_{x.days}")
         exp = pd.Series(["Timedelta_1", "Timedelta_2"])
         tm.assert_series_equal(res, exp)
 
         # period
         vals = [pd.Period("2011-01-01", freq="M"), pd.Period("2011-01-02", freq="M")]
         s = pd.Series(vals)
         assert s.dtype == "Period[M]"
-        res = s.map(lambda x: "{0}_{1}".format(x.__class__.__name__, x.freqstr))
+        res = s.apply(lambda x: f"{type(x).__name__}_{x.freqstr}")
         exp = pd.Series(["Period_M", "Period_M"])
         tm.assert_series_equal(res, exp)
 

pandas/tests/test_base.py

@@ -400,7 +400,7 @@ def test_value_counts_unique_nunique(self):
 
             result = o.unique()
             if isinstance(o, Index):
-                assert isinstance(result, o.__class__)
+                assert isinstance(result, type(o))
                 tm.assert_index_equal(result, orig)
                 assert result.dtype == orig.dtype
             elif is_datetime64tz_dtype(o):

pandas/tests/tseries/holiday/test_holiday.py

@@ -238,7 +238,7 @@ class TestCalendar(AbstractHolidayCalendar):
         rules = []
 
     calendar = get_calendar("TestCalendar")
-    assert TestCalendar == calendar.__class__
+    assert TestCalendar == type(calendar)
 
 
 def test_factory():

pandas/tests/tseries/offsets/test_offsets.py

@@ -358,7 +358,7 @@ def _check_offsetfunc_works(self, offset, funcname, dt, expected, normalize=Fals
         ts = Timestamp(dt) + Nano(5)
 
         if (
-            offset_s.__class__.__name__ == "DateOffset"
+            type(offset_s).__name__ == "DateOffset"
             and (funcname == "apply" or normalize)
             and ts.nanosecond > 0
         ):
@@ -395,7 +395,7 @@ def _check_offsetfunc_works(self, offset, funcname, dt, expected, normalize=Fals
             ts = Timestamp(dt, tz=tz) + Nano(5)
 
             if (
-                offset_s.__class__.__name__ == "DateOffset"
+                type(offset_s).__name__ == "DateOffset"
                 and (funcname == "apply" or normalize)
                 and ts.nanosecond > 0
             ):

pandas/tseries/holiday.py

@@ -363,7 +363,7 @@ def __init__(self, name=None, rules=None):
         """
         super().__init__()
         if name is None:
-            name = self.__class__.__name__
+            name = type(self).__name__
         self.name = name
 
         if rules is not None: