如何在Python中将整个文件夹的BMP图像转换为PPM？

import os
from PIL import Image

def convert_bmp_to_ppm(file_path):
    img = Image.open(file_path)
    ppm_path = os.path.splitext(file_path)[0] + '.ppm'
    img.save(ppm_path)

def convert_folder_bmp_to_ppm(folder_path):
    for file_name in os.listdir(folder_path):
        if file_name.endswith('.bmp'):
            file_path = os.path.join(folder_path, file_name)
            convert_bmp_to_ppm(file_path)

folder_path = 'your_folder_path'
convert_folder_bmp_to_ppm(folder_path)