STY: Apply ruff/Pylint rule PLW0108

Lambda may be unnecessary; consider inlining inner function
numpy · charris · Apr 18, 2025 · Apr 17, 2025 · Apr 17, 2025 · Apr 18, 2025
commit 4233c813f5d652096297f66ad04fd03ee60810ce
diff --git a/numpy/_core/tests/test_arrayprint.py b/numpy/_core/tests/test_arrayprint.py
@@ -245,9 +245,9 @@ def _format_function(x):
                 "[. o O]")
         assert_(np.array2string(x, formatter={'all': lambda x: "%.4f" % x}) ==
                 "[0.0000 1.0000 2.0000]")
-        assert_equal(np.array2string(x, formatter={'int': lambda x: hex(x)}),
+        assert_equal(np.array2string(x, formatter={'int': hex}),
                 x_hex)
-        assert_equal(np.array2string(x, formatter={'int': lambda x: oct(x)}),
+        assert_equal(np.array2string(x, formatter={'int': oct}),
                 x_oct)
 
         x = np.arange(3.)

diff --git a/numpy/_core/tests/test_deprecations.py b/numpy/_core/tests/test_deprecations.py
@@ -220,7 +220,7 @@ class TestCtypesGetter(_DeprecationTestCase):
     )
     def test_deprecated(self, name: str) -> None:
         func = getattr(self.ctypes, name)
-        self.assert_deprecated(lambda: func())
+        self.assert_deprecated(func)
 
     @pytest.mark.parametrize(
         "name", ["data", "shape", "strides", "_as_parameter_"]
@@ -361,7 +361,7 @@ def test_lib_functions_deprecation_call(self):
         self.assert_deprecated(lambda: recfromtxt(data_gen(), **kwargs))
 
         self.assert_deprecated(lambda: disp("test"))
-        self.assert_deprecated(lambda: get_array_wrap())
+        self.assert_deprecated(get_array_wrap)
         self.assert_deprecated(lambda: maximum_sctype(int))
 
         self.assert_deprecated(lambda: in1d([1], [1]))

diff --git a/numpy/_core/tests/test_multiarray.py b/numpy/_core/tests/test_multiarray.py
@@ -3743,8 +3743,8 @@ def test_conjugate(self):
         assert_equal(ac, np.conjugate(a))
 
         a = np.array([1 - 1j, 1, 2.0, 'f'], object)
-        assert_raises(TypeError, lambda: a.conj())
-        assert_raises(TypeError, lambda: a.conjugate())
+        assert_raises(TypeError, a.conj)
+        assert_raises(TypeError, a.conjugate)
 
     def test_conjugate_out(self):
         # Minimal test for the out argument being passed on correctly

diff --git a/numpy/f2py/tests/test_callback.py b/numpy/f2py/tests/test_callback.py
@@ -61,7 +61,7 @@ def check_function(self, name):
         assert r == 6
         r = t(lambda a: 5 + a, fun_extra_args=(7, ))
         assert r == 12
-        r = t(lambda a: math.degrees(a), fun_extra_args=(math.pi, ))
+        r = t(math.degrees, fun_extra_args=(math.pi, ))
         assert r == 180
         r = t(math.degrees, fun_extra_args=(math.pi, ))
         assert r == 180

diff --git a/numpy/lib/_function_base_impl.py b/numpy/lib/_function_base_impl.py
@@ -67,7 +67,7 @@
     # --- HYNDMAN and FAN METHODS
     # Discrete methods
     'inverted_cdf': {
-        'get_virtual_index': lambda n, quantiles: _inverted_cdf(n, quantiles),
+        'get_virtual_index': _inverted_cdf,
         'fix_gamma': None,  # should never be called
     },
     'averaged_inverted_cdf': {
@@ -79,8 +79,7 @@
             where=gamma == 0),
     },
     'closest_observation': {
-        'get_virtual_index': lambda n, quantiles: _closest_observation(n,
-                                                                    quantiles),
+        'get_virtual_index': _closest_observation,
         'fix_gamma': None,  # should never be called
     },
     # Continuous methods

diff --git a/numpy/lib/tests/test_function_base.py b/numpy/lib/tests/test_function_base.py
@@ -3057,7 +3057,7 @@ def test_non_finite_behavior_exact_x(self):
         assert_almost_equal(np.interp(x, xp, fp), [1, 2, np.nan, np.nan, 4])
 
     @pytest.fixture(params=[
-        lambda x: np.float64(x),
+        np.float64,
         lambda x: _make_complex(x, 0),
         lambda x: _make_complex(0, x),
         lambda x: _make_complex(x, np.multiply(x, -2))

diff --git a/numpy/testing/_private/utils.py b/numpy/testing/_private/utils.py
@@ -1396,7 +1396,7 @@ def rundocs(filename=None, raise_on_error=True):
 
     msg = []
     if raise_on_error:
-        out = lambda s: msg.append(s)
+        out = msg.append
     else:
         out = None