CLN: replace lambdas with named functions so they are labeled in asv (p…

…andas-dev#24629)

asv_bench/benchmarks/ctors.py

@@ -3,17 +3,55 @@
 from pandas import Series, Index, DatetimeIndex, Timestamp, MultiIndex
 
 
+def no_change(arr):
+    return arr
+
+
+def list_of_str(arr):
+    return list(arr.astype(str))
+
+
+def gen_of_str(arr):
+    return (x for x in arr.astype(str))
+
+
+def arr_dict(arr):
+    return dict(zip(range(len(arr)), arr))
+
+
+def list_of_tuples(arr):
+    return [(i, -i) for i in arr]
+
+
+def gen_of_tuples(arr):
+    return ((i, -i) for i in arr)
+
+
+def list_of_lists(arr):
+    return [[i, -i] for i in arr]
+
+
+def list_of_tuples_with_none(arr):
+    return [(i, -i) for i in arr][:-1] + [None]
+
+
+def list_of_lists_with_none(arr):
+    return [[i, -i] for i in arr][:-1] + [None]
+
+
 class SeriesConstructors(object):
 
     param_names = ["data_fmt", "with_index"]
-    params = [[lambda x: x,
+    params = [[no_change,
                list,
-               lambda arr: list(arr.astype(str)),
-               lambda arr: dict(zip(range(len(arr)), arr)),
-               lambda arr: [(i, -i) for i in arr],
-               lambda arr: [[i, -i] for i in arr],
-               lambda arr: ([(i, -i) for i in arr][:-1] + [None]),
-               lambda arr: ([[i, -i] for i in arr][:-1] + [None])],
+               list_of_str,
+               gen_of_str,
+               arr_dict,
+               list_of_tuples,
+               gen_of_tuples,
+               list_of_lists,
+               list_of_tuples_with_none,
+               list_of_lists_with_none],
               [False, True]]
 
     def setup(self, data_fmt, with_index):