python3 pdf解密，让其可编辑、可打印等

# coding:utf-8
import os
from PyPDF2 import PdfReader
from PyPDF2 import PdfWriter

def decrypt_pdf(filename, password, decrypted_filename=None):
   """
   将加密的文件及逆行解密, 并生成一个无需密码pdf文件
   :param filename: 原先加密的pdf文件
   :param password: 对应的密码
   :param decrypted_filename: 解密之后的文件名
   :return:
   """
   # 生成一个Reader和Writer
   print('run  jiemi')
   pdf_reader = get_reader(filename, password)
   if pdf_reader is None:
       return
   if not pdf_reader.is_encrypted:
       print('文件没有被加密, 无需操作！')
       return
   pdf_writer = PdfWriter()
   
   pdf_writer.append_pages_from_reader(pdf_reader)
   
   if decrypted_filename is None:
       decrypted_filename = "".join(filename.split('.')[:-1]) + '_' + 'decrypted' + '.pdf'
   
   # 写入新文件
   pdf_writer.write(open(decrypted_filename, 'wb'))

def get_reader(filename, password):
   try:
       old_file = open(filename, 'rb')
       print('run  jiemi1')
   except Exception as err:
       print('文件打开失败！' + str(err))
       return None
   
   # 创建读实例
   pdf_reader = PdfReader(old_file, strict=False)
   
   # 解密操作
   if pdf_reader.is_encrypted:
       if password is None:
           print('%s文件被加密, 需要密码！' % filename)
           return None
       else:
           if pdf_reader.decrypt(password) != 1:
               print('%s密码不正确! ' % filename)
               return None
           if old_file in locals():
               old_file.close()
           return pdf_reader

decrypt_pdf(r'0627.pdf', '')