多文件夹图片转PDF脚本CMD执行即退出，Pycharm显示退出码0求助

我编写了一个用于将多文件夹中的图片转换为PDF进行归档的Python脚本，昨日该脚本正常完成了245个文件夹的转换任务，但今日在CMD中执行时会立即返回命令提示符，在PyCharm中调试则显示退出码0，无任何输出。

脚本代码 #

import os
from PIL import Image

def convert_images_to_pdf(folder_path, output_pdf):
    image_files = [os.path.join(root, file) for root, _, files in os.walk(folder_path)
                   for file in files if file.lower().endswith(('jpg', 'jpeg', 'png'))]
    
    if not image_files:
        print("No image files found in", folder_path)
        return

    try:
        first_image = Image.open(image_files[0])
        first_image.save(output_pdf, "PDF", resolution=100.0, save_all=True,
                         append_images=[Image.open(image_file) for image_file in image_files[1:]])
        print("PDF saved to", output_pdf)
    except MemoryError:
        print("Memory error occurred while processing folder:", folder_path)
        log_memory_error(folder_path, "E:/memory_error.log")

def load_processed_folders(log_file):
    return set(line.strip() for line in open(log_file, 'r') if os.path.isdir(line.strip()))

def save_processed_folder(log_file, folder_path):
    with open(log_file, 'a') as f:
        f.write(folder_path + '\n')

def log_memory_error(folder_path, log_file):
    with open(log_file, 'a') as f:
        f.write(folder_path + '\n')

# Example usage
root_folder = "E:/RESIDENTIAL"
output_folder = "E:/RESIDENTIAL_OUTPUT"
log_file = "E:/processed_folders.log"
memory_error_log_file = "E:/memory_error.log"

processed_folders = load_processed_folders(log_file)

for folder_name in os.listdir(root_folder):
    folder_path = os.path.join(root_folder, folder_name)
    if os.path.isdir(folder_path) and folder_path not in processed_folders:
        output_pdf = os.path.join(output_folder, folder_name + ".pdf")
        convert_images_to_pdf(folder_path, output_pdf)
        save_processed_folder(log_file, folder_path)

预期与实际结果 #

• 预期结果：CMD中会打印处理日志，输出文件夹生成对应PDF文件
  
• 实际结果：CMD无任何输出，直接返回命令提示符
  

注：为保护隐私，已对文件名打码。

问题分析与解决方案 #

核心原因 #

退出码0说明脚本无异常正常执行完毕，大概率是所有待处理文件夹已被标记为已处理，导致循环未进入任何处理逻辑。

排查步骤 #

1. 检查E:/processed_folders.log文件内容，确认是否包含E:/RESIDENTIAL下的所有子文件夹。如果是，说明没有未处理任务，脚本自然无输出。
2. 若存在未处理文件夹，检查日志中记录的路径与脚本生成的folder_path是否完全一致（比如Windows下反斜杠\与正斜杠/的差异、大小写差异）——集合匹配要求字符串完全一致，路径格式不匹配会导致误判，但脚本无输出说明更可能是所有文件夹已处理。

优化与修复方案 #

1. 添加调试输出：在循环前加入统计代码，明确待处理文件夹数量：

   print(f"已处理文件夹数量：{len(processed_folders)}")
   all_folders = [os.path.join(root_folder, name) for name in os.listdir(root_folder) if os.path.isdir(os.path.join(root_folder, name))]
   print(f"总文件夹数量：{len(all_folders)}")
   unprocessed = [f for f in all_folders if f not in processed_folders]
   print(f"待处理文件夹数量：{len(unprocessed)}")
   

2. 完善日志文件处理：修改load_processed_folders函数，处理日志文件不存在的情况：

   def load_processed_folders(log_file):
       if not os.path.exists(log_file):
           return set()
       with open(log_file, 'r') as f:
           return set(line.strip() for line in f if os.path.isdir(line.strip()))
   

3. 修正已处理记录逻辑：当前脚本无论处理成功还是失败（如内存错误）都会标记为已处理，导致失败的文件夹无法重试。修改为仅成功生成PDF后才记录：

   try:
       first_image = Image.open(image_files[0])
       first_image.save(output_pdf, "PDF", resolution=100.0, save_all=True,
                        append_images=[Image.open(image_file) for image_file in image_files[1:]])
       print("PDF saved to", output_pdf)
       save_processed_folder(log_file, folder_path)  # 成功才记录已处理
   except MemoryError:
       print("Memory error occurred while processing folder:", folder_path)
       log_memory_error(folder_path, memory_error_log_file)
       # 不记录已处理，下次可重试
   

内容的提问来源于stack exchange，提问作者Donzskie Just Passing By