写一段python代码，要求在导入一个csv文件，可以将其中的数据以四个时间段（6：00～7：30，7：30～15：30，15：00～17：00，17：00～6：00）区分，统计四个方向（东南西北）的区别下所出现的次数，

import csv
from collections import defaultdict

def count_directions(file_path):
    time_periods = [("6:00", "7:30"), ("7:30", "15:30"), ("15:00", "17:00"), ("17:00", "24:00"), ("00:00", "6:00")]
    directions = ["东", "南", "西", "北"]
    counts = defaultdict(lambda: defaultdict(int))

    with open(file_path, newline='', encoding='utf-8') as csvfile:
        reader = csv.reader(csvfile)
        next(reader)  # 跳过表头
        for row in reader:
            time, direction = row[0], row[1]
            for i, (start, end) in enumerate(time_periods):
                if start <= time < end:
                    counts[i][direction] += 1
                    break

    return counts

file_path = "your_csv_file.csv"
result = count_directions(file_path)
for period, direction_counts in result.items():
    print(f"时间段 {period + 1}:")
    for direction, count in direction_counts.items():
        print(f"{direction}: {count}次")