[Effective Python] 情境：考慮使用產生器而非回傳串列

def find_matched_number_location(number, numbers):
    result = []
    if numbers:
        for index, number_in_list in enumerate(numbers):
            if number_in_list == number:
                result.append(index+1)

    return result



result = find_matched_number_location(3, [1, 2, 4, 5, 2, 3, 12, 3, 5, 7, 1])
print(result)

def find_matched_number_location_new(number, numbers):
    if numbers:
        for index, number_in_list in enumerate(numbers):
            if number_in_list == number:
                yield index + 1

result_new = list(find_matched_number_location_new(3, [1, 2, 4, 5, 2, 3, 12, 3, 5, 7, 1]))
print(result_new)

def find_matched_number_location_from_file(number, handle):
    offset = 0
    for line in handle:
        if line:
            for number_in_file in line.split(','):
                offset += 1
                if int(number_in_file) == number:
                    yield offset

start = time.time()
with open('新增資料夾/test_data.txt', 'r') as f:
    it = find_matched_number_location_from_file(3, f)
    result = list(it)
    print(len(result))
end = time.time()
print( '花費 %.3f 秒' % (end - start) )

start = time.time()
with open('新增資料夾/test_data.txt', 'r') as f:
    result = []
    for line in f:
        for index , number_in_file in enumerate(line.split( ',' )):
            if int(number_in_file) == 3:
                result.append(index + 1)
    print(len(result))
end = time.time()
print('花費 %.3f 秒' % (end - start))