【问题描述】用Python如何为PDF文档批量加密和解密呢？
【小千解答】使用scandir获取文件清单，使用PyPDF2库实现加密和解密。
代码如下：
import os
from PyPDF2 import PdfFileReader,PdfFileWriter
xqpath = 'd:\\xqoffice'
# 加密
for xqfile in os.scandir(xqpath):
pdf_reader = PdfFileReader(xqfile.path)
pdf_writer = PdfFileWriter()
for pagenum in range(pdf_reader.getNumPages()):
pageobj = pdf_reader.getPage(pagenum)
pdf_writer.addPage(pageobj)
pdf_writer.encrypt('xqoffice.cn')
with open(xqfile.path,'wb') as xqpdf:
pdf_writer.write(xqpdf)
# 解密
for xqfile in os.scandir(xqpath):
pdf_reader = PdfFileReader(xqfile.path)
pdf_reader.decrypt('xqoffice.cn')
pdf_writer = PdfFileWriter()
for pagenum in range(pdf_reader.getNumPages()):
pageobj = pdf_reader.getPage(pagenum)
pdf_writer.addPage(pageobj)
with open(xqfile.path,'wb') as xqpdf:
pdf_writer.write(xqpdf)注：如果运行代码报错如下，参照参考资料3修改PyPDF2库的源码。
UnicodeEncodeError: 'latin-1' codec can't encode characters in position 8-9: ordinal not in range(256)
【参考资料】
