注意：前提是你知道密码，本代码不是暴力跑字典

最近有个需求，下载了一堆PDF，但都有加密，密码还不一样，每次打开都要输密码很麻烦，所有有了此工具，批量去除所有密码。

python">import os
from pypdf import PdfReader, PdfWriterdef decrypt_pdfs(folder_path, passwords):for filename in os.listdir(folder_path):if filename.endswith('.pdf'):file_path = os.path.join(folder_path, filename)try:with open(file_path, 'rb') as pdf_file:pdf_reader = PdfReader(pdf_file)if pdf_reader.is_encrypted:success = Falsefor password in passwords:try:pdf_reader.decrypt(password)if pdf_reader.pages:pdf_writer = PdfWriter()for page_num in range(len(pdf_reader.pages)):page = pdf_reader.pages[page_num]pdf_writer.add_page(page)file_name_without_ext = os.path.splitext(filename)[0]new_file_name = f"{file_name_without_ext}_decrypted.pdf"new_file_path = os.path.join(folder_path, new_file_name)with open(new_file_path, 'wb') as new_pdf_file:pdf_writer.write(new_pdf_file)print(f"已使用密码 {password} 成功解密并保存为: {new_file_path}")success = Truebreakexcept Exception:continueif not success:print(f"!!!!无法使用提供的任何密码解密 {filename}")else:print(f"{filename} 无密码，无需处理。")except Exception as e:print(f"处理文件 {filename} 时出现错误: {e}")# 你的PDF文件所在文件夹路径
folder_path = 'C:\\Users\\lianq\\Downloads'
# 实际可能的密码组
passwords = ['12345678', '123qwe', '123456']
decrypt_pdfs(folder_path, passwords)