写一段python代码，要求在导入一个csv文件，可以将其中的数据在四个时间段（6：00～7：30，7：30～15：30，15：00～17：00，17：00～6：00），四个方向（东南西北）的区别下所出现的次数进行计数，

import csv
from collections import defaultdict

def count_times(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"]
    count_dict = defaultdict(lambda: defaultdict(int))

    with open(file_path, 'r', encoding='utf-8') as csvfile:
        reader = csv.reader(csvfile)
        next(reader)  # 跳过表头
        for row in reader:
            time_str, direction = row[0], row[1]
            hour, minute = map(int, time_str.split(':'))
            if hour >= 24:
                hour -= 24
            time_in_minutes = hour * 60 + minute

            for period_start, period_end in time_periods:
                start_hour, start_minute = map(int, period_start.split(':'))
                end_hour, end_minute = map(int, period_end.split(':'))
                if end_hour < start_hour:
                    end_hour += 24
                period_start_in_minutes = start_hour * 60 + start_minute
                period_end_in_minutes = end_hour * 60 + end_minute

                if period_start_in_minutes <= time_in_minutes < period_end_in_minutes:
                    count_dict[direction][f"{period_start}-{period_end}"] += 1
                    break

    return count_dict

file_path = "your_csv_file.csv"
result = count_times(file_path)
print(result)