MAINT: tm.assert_raises_regex --> pytest.raises (pandas-dev#23592)

* MAINT: tm.assert_raises_regex --> pytest.raises

pytest.raises has all of the functionality that
we need from tm.assert_raises_regex.

Closes pandas-devgh-16521.

* Don't remove, just deprecate assert_raises_regex

* CLN: Test cleanups and follow-ups

pandas/tests/arithmetic/test_datetime64.py

@@ -687,7 +687,7 @@ def check(get_ser, test_ser):
             # with 'operate' (from core/ops.py) for the ops that are not
             # defined
             op = getattr(get_ser, op_str, None)
-            with tm.assert_raises_regex(TypeError, 'operate|cannot'):
+            with pytest.raises(TypeError, match='operate|cannot'):
                 op(test_ser)
 
         # ## timedelta64 ###
@@ -1042,9 +1042,9 @@ def test_dti_add_timestamp_raises(self, box_with_datetime):
         idx = DatetimeIndex(['2011-01-01', '2011-01-02'])
         idx = tm.box_expected(idx, box_with_datetime)
         msg = "cannot add"
-        with tm.assert_raises_regex(TypeError, msg):
+        with pytest.raises(TypeError, match=msg):
             idx + Timestamp('2011-01-01')
-        with tm.assert_raises_regex(TypeError, msg):
+        with pytest.raises(TypeError, match=msg):
             Timestamp('2011-01-01') + idx
 
     # -------------------------------------------------------------
@@ -1268,15 +1268,15 @@ def test_dti_sub_tdi(self, tz_naive_fixture):
         tm.assert_index_equal(result, expected)
 
         msg = 'cannot subtract .*TimedeltaIndex'
-        with tm.assert_raises_regex(TypeError, msg):
+        with pytest.raises(TypeError, match=msg):
             tdi - dti
 
         # sub with timedelta64 array
         result = dti - tdi.values
         tm.assert_index_equal(result, expected)
 
         msg = 'cannot subtract DatetimeIndex from'
-        with tm.assert_raises_regex(TypeError, msg):
+        with pytest.raises(TypeError, match=msg):
             tdi.values - dti
 
     def test_dti_isub_tdi(self, tz_naive_fixture):
@@ -1292,7 +1292,7 @@ def test_dti_isub_tdi(self, tz_naive_fixture):
         tm.assert_index_equal(result, expected)
 
         msg = 'cannot subtract .*TimedeltaIndex'
-        with tm.assert_raises_regex(TypeError, msg):
+        with pytest.raises(TypeError, match=msg):
             tdi -= dti
 
         # isub with timedelta64 array
@@ -1303,7 +1303,7 @@ def test_dti_isub_tdi(self, tz_naive_fixture):
         msg = '|'.join(['cannot perform __neg__ with this index type:',
                         'ufunc subtract cannot use operands with types',
                         'cannot subtract DatetimeIndex from'])
-        with tm.assert_raises_regex(TypeError, msg):
+        with pytest.raises(TypeError, match=msg):
             tdi.values -= dti
 
     # -------------------------------------------------------------
@@ -1323,9 +1323,9 @@ def test_add_datetimelike_and_dti(self, addend, tz):
         # GH#9631
         dti = DatetimeIndex(['2011-01-01', '2011-01-02']).tz_localize(tz)
         msg = 'cannot add DatetimeIndex and {0}'.format(type(addend).__name__)
-        with tm.assert_raises_regex(TypeError, msg):
+        with pytest.raises(TypeError, match=msg):
             dti + addend
-        with tm.assert_raises_regex(TypeError, msg):
+        with pytest.raises(TypeError, match=msg):
             addend + dti
 
     # -------------------------------------------------------------

pandas/tests/arithmetic/test_period.py

@@ -118,27 +118,27 @@ def test_parr_cmp_pi_mismatched_freq_raises(self, freq, box_df_fail):
         base = tm.box_expected(base, box)
 
         msg = "Input has different freq=A-DEC from "
-        with tm.assert_raises_regex(period.IncompatibleFrequency, msg):
+        with pytest.raises(period.IncompatibleFrequency, match=msg):
             base <= Period('2011', freq='A')
 
-        with tm.assert_raises_regex(period.IncompatibleFrequency, msg):
+        with pytest.raises(period.IncompatibleFrequency, match=msg):
             Period('2011', freq='A') >= base
 
         # TODO: Could parametrize over boxes for idx?
         idx = PeriodIndex(['2011', '2012', '2013', '2014'], freq='A')
-        with tm.assert_raises_regex(period.IncompatibleFrequency, msg):
+        with pytest.raises(period.IncompatibleFrequency, match=msg):
             base <= idx
 
         # Different frequency
         msg = "Input has different freq=4M from "
-        with tm.assert_raises_regex(period.IncompatibleFrequency, msg):
+        with pytest.raises(period.IncompatibleFrequency, match=msg):
             base <= Period('2011', freq='4M')
 
-        with tm.assert_raises_regex(period.IncompatibleFrequency, msg):
+        with pytest.raises(period.IncompatibleFrequency, match=msg):
             Period('2011', freq='4M') >= base
 
         idx = PeriodIndex(['2011', '2012', '2013', '2014'], freq='4M')
-        with tm.assert_raises_regex(period.IncompatibleFrequency, msg):
+        with pytest.raises(period.IncompatibleFrequency, match=msg):
             base <= idx
 
     @pytest.mark.parametrize('freq', ['M', '2M', '3M'])
@@ -190,10 +190,10 @@ def test_pi_cmp_nat_mismatched_freq_raises(self, freq):
 
         diff = PeriodIndex(['2011-02', '2011-01', '2011-04', 'NaT'], freq='4M')
         msg = "Input has different freq=4M from PeriodIndex"
-        with tm.assert_raises_regex(period.IncompatibleFrequency, msg):
+        with pytest.raises(period.IncompatibleFrequency, match=msg):
             idx1 > diff
 
-        with tm.assert_raises_regex(period.IncompatibleFrequency, msg):
+        with pytest.raises(period.IncompatibleFrequency, match=msg):
             idx1 == diff
 
     # TODO: De-duplicate with test_pi_cmp_nat
@@ -708,13 +708,13 @@ def test_pi_add_sub_timedeltalike_freq_mismatch_daily(self, not_daily):
         other = not_daily
         rng = pd.period_range('2014-05-01', '2014-05-15', freq='D')
         msg = 'Input has different freq(=.+)? from Period.*?\\(freq=D\\)'
-        with tm.assert_raises_regex(period.IncompatibleFrequency, msg):
+        with pytest.raises(period.IncompatibleFrequency, match=msg):
             rng + other
-        with tm.assert_raises_regex(period.IncompatibleFrequency, msg):
+        with pytest.raises(period.IncompatibleFrequency, match=msg):
             rng += other
-        with tm.assert_raises_regex(period.IncompatibleFrequency, msg):
+        with pytest.raises(period.IncompatibleFrequency, match=msg):
             rng - other
-        with tm.assert_raises_regex(period.IncompatibleFrequency, msg):
+        with pytest.raises(period.IncompatibleFrequency, match=msg):
             rng -= other
 
     def test_pi_add_iadd_timedeltalike_hourly(self, two_hours):
@@ -734,10 +734,10 @@ def test_pi_add_timedeltalike_mismatched_freq_hourly(self, not_hourly):
         rng = pd.period_range('2014-01-01 10:00', '2014-01-05 10:00', freq='H')
         msg = 'Input has different freq(=.+)? from Period.*?\\(freq=H\\)'
 
-        with tm.assert_raises_regex(period.IncompatibleFrequency, msg):
+        with pytest.raises(period.IncompatibleFrequency, match=msg):
             rng + other
 
-        with tm.assert_raises_regex(period.IncompatibleFrequency, msg):
+        with pytest.raises(period.IncompatibleFrequency, match=msg):
             rng += other
 
     def test_pi_sub_isub_timedeltalike_hourly(self, two_hours):
@@ -768,13 +768,13 @@ def test_pi_add_sub_timedeltalike_freq_mismatch_annual(self,
         rng = pd.period_range('2014', '2024', freq='A')
         msg = ('Input has different freq(=.+)? '
                'from Period.*?\\(freq=A-DEC\\)')
-        with tm.assert_raises_regex(period.IncompatibleFrequency, msg):
+        with pytest.raises(period.IncompatibleFrequency, match=msg):
             rng + other
-        with tm.assert_raises_regex(period.IncompatibleFrequency, msg):
+        with pytest.raises(period.IncompatibleFrequency, match=msg):
             rng += other
-        with tm.assert_raises_regex(period.IncompatibleFrequency, msg):
+        with pytest.raises(period.IncompatibleFrequency, match=msg):
             rng - other
-        with tm.assert_raises_regex(period.IncompatibleFrequency, msg):
+        with pytest.raises(period.IncompatibleFrequency, match=msg):
             rng -= other
 
     def test_pi_add_iadd_timedeltalike_M(self):
@@ -792,13 +792,13 @@ def test_pi_add_sub_timedeltalike_freq_mismatch_monthly(self,
         other = mismatched_freq
         rng = pd.period_range('2014-01', '2016-12', freq='M')
         msg = 'Input has different freq(=.+)? from Period.*?\\(freq=M\\)'
-        with tm.assert_raises_regex(period.IncompatibleFrequency, msg):
+        with pytest.raises(period.IncompatibleFrequency, match=msg):
             rng + other
-        with tm.assert_raises_regex(period.IncompatibleFrequency, msg):
+        with pytest.raises(period.IncompatibleFrequency, match=msg):
             rng += other
-        with tm.assert_raises_regex(period.IncompatibleFrequency, msg):
+        with pytest.raises(period.IncompatibleFrequency, match=msg):
             rng - other
-        with tm.assert_raises_regex(period.IncompatibleFrequency, msg):
+        with pytest.raises(period.IncompatibleFrequency, match=msg):
             rng -= other
 
     def test_parr_add_sub_td64_nat(self, box):
@@ -907,14 +907,14 @@ def test_pi_ops_errors(self, ng, box_with_period):
         obj = tm.box_expected(idx, box_with_period)
 
         msg = r"unsupported operand type\(s\)"
-        with tm.assert_raises_regex(TypeError, msg):
+        with pytest.raises(TypeError, match=msg):
             obj + ng
 
         with pytest.raises(TypeError):
             # error message differs between PY2 and 3
             ng + obj
 
-        with tm.assert_raises_regex(TypeError, msg):
+        with pytest.raises(TypeError, match=msg):
             obj - ng
 
         with pytest.raises(TypeError):
@@ -1009,13 +1009,13 @@ def test_pi_offset_errors(self):
         # from Period
         msg = r"Input has different freq from Period.*?\(freq=D\)"
         for obj in [idx, ser]:
-            with tm.assert_raises_regex(period.IncompatibleFrequency, msg):
+            with pytest.raises(period.IncompatibleFrequency, match=msg):
                 obj + pd.offsets.Hour(2)
 
-            with tm.assert_raises_regex(period.IncompatibleFrequency, msg):
+            with pytest.raises(period.IncompatibleFrequency, match=msg):
                 pd.offsets.Hour(2) + obj
 
-            with tm.assert_raises_regex(period.IncompatibleFrequency, msg):
+            with pytest.raises(period.IncompatibleFrequency, match=msg):
                 obj - pd.offsets.Hour(2)
 
     def test_pi_sub_period(self):

pandas/tests/arithmetic/test_timedelta64.py

@@ -161,22 +161,22 @@ def test_tdi_add_timestamp_nat_masking(self):
     def test_tdi_add_overflow(self):
         # See GH#14068
         msg = "too (big|large) to convert"
-        with tm.assert_raises_regex(OverflowError, msg):
+        with pytest.raises(OverflowError, match=msg):
             pd.to_timedelta(106580, 'D') + Timestamp('2000')
-        with tm.assert_raises_regex(OverflowError, msg):
+        with pytest.raises(OverflowError, match=msg):
             Timestamp('2000') + pd.to_timedelta(106580, 'D')
 
         _NaT = int(pd.NaT) + 1
         msg = "Overflow in int64 addition"
-        with tm.assert_raises_regex(OverflowError, msg):
+        with pytest.raises(OverflowError, match=msg):
             pd.to_timedelta([106580], 'D') + Timestamp('2000')
-        with tm.assert_raises_regex(OverflowError, msg):
+        with pytest.raises(OverflowError, match=msg):
             Timestamp('2000') + pd.to_timedelta([106580], 'D')
-        with tm.assert_raises_regex(OverflowError, msg):
+        with pytest.raises(OverflowError, match=msg):
             pd.to_timedelta([_NaT]) - Timedelta('1 days')
-        with tm.assert_raises_regex(OverflowError, msg):
+        with pytest.raises(OverflowError, match=msg):
             pd.to_timedelta(['5 days', _NaT]) - Timedelta('1 days')
-        with tm.assert_raises_regex(OverflowError, msg):
+        with pytest.raises(OverflowError, match=msg):
             (pd.to_timedelta([_NaT, '5 days', '1 hours']) -
              pd.to_timedelta(['7 seconds', _NaT, '4 hours']))
 
@@ -415,7 +415,7 @@ def test_td64arr_sub_timestamp_raises(self, box):
         msg = ("cannot subtract a datelike from|"
                "Could not operate|"
                "cannot perform operation")
-        with tm.assert_raises_regex(TypeError, msg):
+        with pytest.raises(TypeError, match=msg):
             idx - Timestamp('2011-01-01')
 
     def test_td64arr_add_timestamp(self, box, tz_naive_fixture):
@@ -1217,9 +1217,9 @@ def test_td64arr_mul_tdscalar_invalid(self, box, scalar_td):
         # with 'operate' (from core/ops.py) for the ops that are not
         # defined
         pattern = 'operate|unsupported|cannot|not supported'
-        with tm.assert_raises_regex(TypeError, pattern):
+        with pytest.raises(TypeError, match=pattern):
             td1 * scalar_td
-        with tm.assert_raises_regex(TypeError, pattern):
+        with pytest.raises(TypeError, match=pattern):
             scalar_td * td1
 
     def test_td64arr_mul_too_short_raises(self, box):
@@ -1399,8 +1399,8 @@ def test_td64arr_pow_invalid(self, scalar_td, box):
         # with 'operate' (from core/ops.py) for the ops that are not
         # defined
         pattern = 'operate|unsupported|cannot|not supported'
-        with tm.assert_raises_regex(TypeError, pattern):
+        with pytest.raises(TypeError, match=pattern):
             scalar_td ** td1
 
-        with tm.assert_raises_regex(TypeError, pattern):
+        with pytest.raises(TypeError, match=pattern):
             td1 ** scalar_td

pandas/tests/arrays/categorical/test_algos.py

@@ -138,5 +138,5 @@ def test_take_fill_value_new_raises(self):
         # https://github.com/pandas-dev/pandas/issues/23296
         cat = pd.Categorical(['a', 'b', 'c'])
         xpr = r"'fill_value' \('d'\) is not in this Categorical's categories."
-        with tm.assert_raises_regex(TypeError, xpr):
+        with pytest.raises(TypeError, match=xpr):
             cat.take([0, 1, -1], fill_value='d', allow_fill=True)

pandas/tests/arrays/categorical/test_analytics.py

@@ -305,7 +305,8 @@ def test_numpy_repeat(self):
         tm.assert_categorical_equal(np.repeat(cat, 2), exp)
 
         msg = "the 'axis' parameter is not supported"
-        tm.assert_raises_regex(ValueError, msg, np.repeat, cat, 2, axis=1)
+        with pytest.raises(ValueError, match=msg):
+            np.repeat(cat, 2, axis=1)
 
     def test_isna(self):
         exp = np.array([False, False, True])

pandas/tests/arrays/categorical/test_api.py

@@ -50,9 +50,9 @@ def test_set_ordered(self):
 
         # removed in 0.19.0
         msg = "can\'t set attribute"
-        with tm.assert_raises_regex(AttributeError, msg):
+        with pytest.raises(AttributeError, match=msg):
             cat.ordered = True
-        with tm.assert_raises_regex(AttributeError, msg):
+        with pytest.raises(AttributeError, match=msg):
             cat.ordered = False
 
     def test_rename_categories(self):

pandas/tests/arrays/categorical/test_constructors.py

@@ -26,10 +26,10 @@ def test_validate_ordered(self):
         # This should be a boolean.
         ordered = np.array([0, 1, 2])
 
-        with tm.assert_raises_regex(exp_err, exp_msg):
+        with pytest.raises(exp_err, match=exp_msg):
             Categorical([1, 2, 3], ordered=ordered)
 
-        with tm.assert_raises_regex(exp_err, exp_msg):
+        with pytest.raises(exp_err, match=exp_msg):
             Categorical.from_codes([0, 0, 1], categories=['a', 'b', 'c'],
                                    ordered=ordered)
 
@@ -351,13 +351,13 @@ def test_constructor_with_dtype(self, ordered):
 
     def test_constructor_dtype_and_others_raises(self):
         dtype = CategoricalDtype(['a', 'b'], ordered=True)
-        with tm.assert_raises_regex(ValueError, "Cannot"):
+        with pytest.raises(ValueError, match="Cannot"):
             Categorical(['a', 'b'], categories=['a', 'b'], dtype=dtype)
 
-        with tm.assert_raises_regex(ValueError, "Cannot"):
+        with pytest.raises(ValueError, match="Cannot"):
             Categorical(['a', 'b'], ordered=True, dtype=dtype)
 
-        with tm.assert_raises_regex(ValueError, "Cannot"):
+        with pytest.raises(ValueError, match="Cannot"):
             Categorical(['a', 'b'], ordered=False, dtype=dtype)
 
     @pytest.mark.parametrize('categories', [
@@ -372,7 +372,7 @@ def test_constructor_str_category(self, categories, ordered):
         tm.assert_categorical_equal(result, expected)
 
     def test_constructor_str_unknown(self):
-        with tm.assert_raises_regex(ValueError, "Unknown `dtype`"):
+        with pytest.raises(ValueError, match="Unknown `dtype`"):
             Categorical([1, 2], dtype="foo")
 
     def test_constructor_from_categorical_with_dtype(self):

pandas/tests/arrays/categorical/test_dtypes.py

@@ -120,7 +120,7 @@ def test_astype(self, ordered):
         tm.assert_numpy_array_equal(result, expected)
 
         msg = 'could not convert string to float'
-        with tm.assert_raises_regex(ValueError, msg):
+        with pytest.raises(ValueError, match=msg):
             cat.astype(float)
 
         # numeric

pandas/tests/arrays/categorical/test_indexing.py

@@ -143,5 +143,5 @@ def test_mask_with_boolean_raises(index):
     if index:
         idx = CategoricalIndex(idx)
 
-    with tm.assert_raises_regex(ValueError, 'NA / NaN'):
+    with pytest.raises(ValueError, match='NA / NaN'):
         s[idx]

pandas/tests/arrays/categorical/test_missing.py

@@ -70,7 +70,7 @@ def test_fillna_raises(self, fillna_kwargs, msg):
         # https://github.com/pandas-dev/pandas/issues/19682
         cat = Categorical([1, 2, 3])
 
-        with tm.assert_raises_regex(ValueError, msg):
+        with pytest.raises(ValueError, match=msg):
             cat.fillna(**fillna_kwargs)
 
     @pytest.mark.parametrize("named", [True, False])

pandas/tests/arrays/categorical/test_operators.py

@@ -238,15 +238,17 @@ def test_unordered_different_order_equal(self, ctor):
     def test_unordered_different_categories_raises(self):
         c1 = Categorical(['a', 'b'], categories=['a', 'b'], ordered=False)
         c2 = Categorical(['a', 'c'], categories=['c', 'a'], ordered=False)
-        with tm.assert_raises_regex(TypeError,
-                                    "Categoricals can only be compared"):
+
+        with pytest.raises(TypeError, match=("Categoricals can "
+                                             "only be compared")):
             c1 == c2
 
     def test_compare_different_lengths(self):
         c1 = Categorical([], categories=['a', 'b'])
         c2 = Categorical([], categories=['a'])
+
         msg = "Categories are different lengths"
-        with tm.assert_raises_regex(TypeError, msg):
+        with pytest.raises(TypeError, match=msg):
             c1 == c2
 
     def test_compare_unordered_different_order(self):