CLN: change lambdas to normal function definitions

Author: toobaz

pandas/tests/frame/test_constructors.py

@@ -501,9 +501,11 @@ def test_constructor_dict_of_tuples(self):
         tm.assert_frame_equal(result, expected, check_dtype=False)
 
     def test_constructor_dict_multiindex(self):
-        check = lambda result, expected: tm.assert_frame_equal(
-            result, expected, check_dtype=True, check_index_type=True,
-            check_column_type=True, check_names=True)
+        def check(result, expected):
+            return tm.assert_frame_equal(result, expected, check_dtype=True,
+                                         check_index_type=True,
+                                         check_column_type=True,
+                                         check_names=True)
         d = {('a', 'a'): {('i', 'i'): 0, ('i', 'j'): 1, ('j', 'i'): 2},
              ('b', 'a'): {('i', 'i'): 6, ('i', 'j'): 5, ('j', 'i'): 4},
              ('b', 'c'): {('i', 'i'): 7, ('i', 'j'): 8, ('j', 'i'): 9}}

pandas/tests/frame/test_indexing.py

@@ -224,7 +224,8 @@ def test_setitem_callable(self):
 
     def test_setitem_other_callable(self):
         # GH 13299
-        inc = lambda x: x + 1
+        def inc(x):
+            return x + 1
 
         df = pd.DataFrame([[-1, 1], [1, -1]])
         df[df > 0] = inc
@@ -2083,7 +2084,8 @@ def test_reindex_level(self):
         icol = ['jim', 'joe', 'jolie']
 
         def verify_first_level(df, level, idx, check_index_type=True):
-            f = lambda val: np.nonzero(df[level] == val)[0]
+            def f(val):
+                return np.nonzero(df[level] == val)[0]
             i = np.concatenate(list(map(f, idx)))
             left = df.set_index(icol).reindex(idx, level=level)
             right = df.iloc[i].set_index(icol)