Для того, чтобы понять, как это работает на низком уровне, можно использовать функцию `dis.dis`
первый вариант:
>>> from dis import dis
>>>
>>> def fast_string_comparison(brand, product_name):
... product_name = product_name.split()
... exact_match_brand = list(set(brand) & set(product_name))
... if exact_match_brand:
... exclusive_matches_brand = set(brand) ^ set(exact_match_brand)
... else:
... exclusive_matches_brand = brand
... return exact_match_brand, exclusive_matches_brand
...
>>> dis(fast_string_comparison)
2 0 LOAD_FAST 1 (product_name)
2 LOAD_METHOD 0 (split)
4 CALL_METHOD 0
6 STORE_FAST 1 (product_name)
3 8 LOAD_GLOBAL 1 (list)
10 LOAD_GLOBAL 2 (set)
12 LOAD_FAST 0 (brand)
14 CALL_FUNCTION 1
16 LOAD_GLOBAL 2 (set)
18 LOAD_FAST 1 (product_name)
20 CALL_FUNCTION 1
22 BINARY_AND
24 CALL_FUNCTION 1
26 STORE_FAST 2 (exact_match_brand)
4 28 LOAD_FAST 2 (exact_match_brand)
30 POP_JUMP_IF_FALSE 50
5 32 LOAD_GLOBAL 2 (set)
34 LOAD_FAST 0 (brand)
36 CALL_FUNCTION 1
38 LOAD_GLOBAL 2 (set)
40 LOAD_FAST 2 (exact_match_brand)
42 CALL_FUNCTION 1
44 BINARY_XOR
46 STORE_FAST 3 (exclusive_matches_brand)
48 JUMP_FORWARD 4 (to 54)
7 >> 50 LOAD_FAST 0 (brand)
52 STORE_FAST 3 (exclusive_matches_brand)
8 >> 54 LOAD_FAST 2 (exact_match_brand)
56 LOAD_FAST 3 (exclusive_matches_brand)
58 BUILD_TUPLE 2
60 RETURN_VALUE
Второй:
>>> from dis import dis
>>> def fast_string_comparison(brand, product_name):
... product_name = product_name.split()
... exact_match_brand = list(set(brand) & set(product_name))
... if exact_match_brand:
... exclusive_matches_brand = set(brand) ^ set(exact_match_brand)
... return exact_match_brand, exclusive_matches_brand
... else:
... return exact_match_brand, brand
...
>>> dis(fast_string_comparison)
2 0 LOAD_FAST 1 (product_name)
2 LOAD_METHOD 0 (split)
4 CALL_METHOD 0
6 STORE_FAST 1 (product_name)
3 8 LOAD_GLOBAL 1 (list)
10 LOAD_GLOBAL 2 (set)
12 LOAD_FAST 0 (brand)
14 CALL_FUNCTION 1
16 LOAD_GLOBAL 2 (set)
18 LOAD_FAST 1 (product_name)
20 CALL_FUNCTION 1
22 BINARY_AND
24 CALL_FUNCTION 1
26 STORE_FAST 2 (exact_match_brand)
4 28 LOAD_FAST 2 (exact_match_brand)
30 POP_JUMP_IF_FALSE 56
5 32 LOAD_GLOBAL 2 (set)
34 LOAD_FAST 0 (brand)
36 CALL_FUNCTION 1
38 LOAD_GLOBAL 2 (set)
40 LOAD_FAST 2 (exact_match_brand)
42 CALL_FUNCTION 1
44 BINARY_XOR
46 STORE_FAST 3 (exclusive_matches_brand)
6 48 LOAD_FAST 2 (exact_match_brand)
50 LOAD_FAST 3 (exclusive_matches_brand)
52 BUILD_TUPLE 2
54 RETURN_VALUE
8 >> 56 LOAD_FAST 2 (exact_match_brand)
58 LOAD_FAST 0 (brand)
60 BUILD_TUPLE 2
62 RETURN_VALUE
64 LOAD_CONST 0 (None)
66 RETURN_VALUE
>>>
