Question: 
Write a function to extract specified size of strings from a give list of string values.


Model's Code:
def extract_string(strings, size):
    return [s for s in strings if len(s) == size]



Sample Correct Code:
def extract_string(str, l):
    result = [e for e in str if len(e) == l] 
    return result


Asserts:
assert extract_string(['Python', 'list', 'exercises', 'practice', 'solution'] ,8)==['practice', 'solution']
assert extract_string(['Python', 'list', 'exercises', 'practice', 'solution'] ,6)==['Python']
assert extract_string(['Python', 'list', 'exercises', 'practice', 'solution'] ,9)==['exercises']


Tests:
Test 1 of 3: PASS
Test 2 of 3: PASS
Test 3 of 3: PASS

Test 450 of 974: 328/450 (72.88888888888889%): success