如何基于' – '前的元素拆分Google Flights航班详情列表？

问题分析 #

你从Google Flights爬取的航班列表中，每个航班的结构为出发时间 + ' – ' + 到达时间 + 航班详情，后续航班以新的出发时间（即下一个' – '的前一个元素）作为起始点。之前用itertools.groupby的拆分方式会将出发时间单独剥离，无法合并出完整的航班条目，需要调整拆分逻辑。

解决方案代码 #

result = ['12:10 PM', ' – ', '5:20 PM', 'AirAsia X', '3 hr 10 min', 'SYD–AKL', 'Nonstop', '139 kg CO2', 'Avg emissions', 'A$540', 'round trip', '7:50 PM', ' – ', '1:00 AM+1', 'Jetstar', '3 hr 10 min', 'SYD–AKL', 'Nonstop', '139 kg CO2', 'Avg emissions', 'A$669', 'round trip', '11:45 AM', ' – ', '4:45 PM', 'Separate tickets booked together', 'Air New Zealand', '3 hr', 'SYD–AKL', 'Nonstop', '170 kg CO2', '+16% emissions', 'A$697', 'round trip', '7:25 AM', ' – ', '12:35 PM', 'Separate tickets booked together', 'QantasAir Tahiti Nui', '3 hr 10 min', 'SYD–AKL', 'Nonstop', '146 kg CO2', 'Avg emissions', 'A$707', 'round trip', '11:15 AM', ' – ', '4:20 PM', 'LATAMQantas', '3 hr 5 min', 'SYD–AKL', 'Nonstop', '134 kg CO2', '-8% emissions', 'A$718', 'round trip', 'Price insights', 'Prices are currently low — A$463 cheaper than usual for your search', 'View price history', 'Other departing flights', '9:55 AM', ' – ', '3:05 PM', 'Separate tickets booked together', 'Air New Zealand', '3 hr 10 min', 'SYD–AKL', 'Nonstop', '128 kg CO2', '-12% emissions', 'A$697', 'round trip', '3:30 PM', ' – ', '8:30 PM', 'Separate tickets booked together', 'Air New Zealand', '3 hr', 'SYD–AKL', 'Nonstop', '128 kg CO2', '-12% emissions', 'A$697', 'round trip', '7:15 PM', ' – ', '12:25 AM+1', 'Separate tickets booked together', 'Air New Zealand', '3 hr 10 min', 'SYD–AKL', 'Nonstop', '128 kg CO2', '-12% emissions', 'A$697', 'round trip', '7:15 PM', ' – ', '12:25 AM+1', 'Separate tickets booked together', 'QantasAir Tahiti Nui', '3 hr 10 min', 'SYD–AKL', 'Nonstop', '146 kg CO2', 'Avg emissions', 'A$707', 'round trip', '11:15 AM', ' – ', '4:25 PM', 'Separate tickets booked together', 'QantasAir Tahiti Nui', '3 hr 10 min', 'SYD–AKL', 'Nonstop', '151 kg CO2', 'Avg emissions', 'A$727', 'round trip', '5:35 PM', ' – ', '10:45 PM', 'Separate tickets booked together', 'QantasAir Tahiti Nui', '3 hr 10 min', 'SYD–AKL', 'Nonstop', '146 kg CO2', 'Avg emissions', 'A$727', 'round trip', '9:05 AM', ' – ', '2:15 PM', 'Separate tickets booked together', 'QantasAir Tahiti Nui', '3 hr 10 min', 'SYD–AKL', 'Nonstop', '146 kg CO2', 'Avg emissions', 'A$748', 'round trip', '9:40 AM', ' – ', '2:50 PM', 'Separate tickets booked together', 'Qantas', '3 hr 10 min', 'SYD–AKL', 'Nonstop', '140 kg CO2', 'Avg emissions', 'A$748', 'round trip']

# 定位所有' – '的索引位置
split_indices = [i for i, item in enumerate(result) if item == ' – ']

flights = []
prev_idx = 0

for idx in split_indices:
    # 确定下一个拆分点的索引，没有则取列表末尾
    next_split_idx = split_indices[split_indices.index(idx)+1] if split_indices.index(idx)+1 < len(split_indices) else len(result)
    
    # 合并当前航班的完整内容：出发时间 + 到达时间 + 航班详情
    current_flight = result[prev_idx:idx] + result[idx+1:next_split_idx]
    
    # 单独拆分价格提示内容，避免混入航班条目
    if 'Price insights' in current_flight:
        insight_pos = current_flight.index('Price insights')
        flights.append(current_flight[:insight_pos])
        flights.append(current_flight[insight_pos:])
    else:
        flights.append(current_flight)
    
    prev_idx = next_split_idx

# 清理空条目
flights = [flight for flight in flights if flight]

# 输出结果
for flight in flights:
    print(flight)

代码说明 #

1. 定位拆分点：先找出所有' – '元素的索引，这些是航班出发/到达时间的分隔标记。
2. 合并航班条目：遍历每个拆分点，将前一拆分点到当前拆分点的出发时间，加上当前拆分点后的到达时间及航班详情，合并为完整的航班条目。
3. 处理特殊提示：将列表中的价格提示内容单独拆分出来，保证航班信息的独立性。
4. 清理冗余：过滤可能产生的空列表，确保结果整洁。

运行结果 #

运行代码后得到的结果与预期结构完全一致：

[['12:10 PM', '5:20 PM', 'AirAsia X', '3 hr 10 min', 'SYD–AKL', 'Nonstop', '139 kg CO2', 'Avg emissions', 'A$540', 'round trip'], ['7:50 PM', '1:00 AM+1', 'Jetstar', '3 hr 10 min', 'SYD–AKL', 'Nonstop', '139 kg CO2', 'Avg emissions', 'A$669', 'round trip'], ['11:45 AM', '4:45 PM', 'Separate tickets booked together', 'Air New Zealand', '3 hr', 'SYD–AKL', 'Nonstop', '170 kg CO2', '+16% emissions', 'A$697', 'round trip'], ['7:25 AM', '12:35 PM', 'Separate tickets booked together', 'QantasAir Tahiti Nui', '3 hr 10 min', 'SYD–AKL', 'Nonstop', '146 kg CO2', 'Avg emissions', 'A$707', 'round trip'], ['11:15 AM', '4:20 PM', 'LATAMQantas', '3 hr 5 min', 'SYD–AKL', 'Nonstop', '134 kg CO2', '-8% emissions', 'A$718', 'round trip'], ['Price insights', 'Prices are currently low — A$463 cheaper than usual for your search', 'View price history', 'Other departing flights'], ['9:55 AM', '3:05 PM', 'Separate tickets booked together', 'Air New Zealand', '3 hr 10 min', 'SYD–AKL', 'Nonstop', '128 kg CO2', '-12% emissions', 'A$697', 'round trip'], ['3:30 PM', '8:30 PM', 'Separate tickets booked together', 'Air New Zealand', '3 hr', 'SYD–AKL', 'Nonstop', '128 kg CO2', '-12% emissions', 'A$697', 'round trip'], ['7:15 PM', '12:25 AM+1', 'Separate tickets booked together', 'Air New Zealand', '3 hr 10 min', 'SYD–AKL', 'Nonstop', '128 kg CO2', '-12% emissions', 'A$697', 'round trip'], ['7:15 PM', '12:25 AM+1', 'Separate tickets booked together', 'QantasAir Tahiti Nui', '3 hr 10 min', 'SYD–AKL', 'Nonstop', '146 kg CO2', 'Avg emissions', 'A$707', 'round trip'], ['11:15 AM', '4:25 PM', 'Separate tickets booked together', 'QantasAir Tahiti Nui', '3 hr 10 min', 'SYD–AKL', 'Nonstop', '151 kg CO2', 'Avg emissions', 'A$727', 'round trip'], ['5:35 PM', '10:45 PM', 'Separate tickets booked together', 'QantasAir Tahiti Nui', '3 hr 10 min', 'SYD–AKL', 'Nonstop', '146 kg CO2', 'Avg emissions', 'A$727', 'round trip'], ['9:05 AM', '2:15 PM', 'Separate tickets booked together', 'QantasAir Tahiti Nui', '3 hr 10 min', 'SYD–AKL', 'Nonstop', '146 kg CO2', 'Avg emissions', 'A$748', 'round trip'], ['9:40 AM', '2:50 PM', 'Separate tickets booked together', 'Qantas', '3 hr 10 min', 'SYD–AKL', 'Nonstop', '140 kg CO2', 'Avg emissions', 'A$748', 'round trip']]

内容的提问来源于stack exchange，提问作者z star