python设置pdf（大熊的遇到的坑）

导出：选用pdfkit

参考官方链接：https://wkhtmltopdf.org/usage/wkhtmltopdf.txt

1.大小

设置导出的大小可以用page-size也可以直接page-wight，page-height：

Page sizes:
  The default page size of the rendered document is A4, but using this
  --page-size optionthis can be changed to almost anything else, such as: A3,
  Letter and Legal.  For a full list of supported pages sizes please see
  <http://qt-project.org/doc/qt-4.8/qprinter.html#PaperSize-enum>.

  For a more fine grained control over the page size the --page-height and
  --page-width options may be used

加密：选用pypdf2，但是pypdf2中所有者和用户密码都给permit所有权限，想设置更高级的安全都不行

去pypdf2的pdf.py源码中找到如下代码

   # permit everything:
        P = -1
        O = ByteStringObject(_alg33(owner_pwd, user_pwd, rev, keylen))
        ID_1 = ByteStringObject(md5(b_(repr(time.time()))).digest())
        ID_2 = ByteStringObject(md5(b_(repr(random.random()))).digest())
        self._ID = ArrayObject((ID_1, ID_2))
        if rev == 2:

权限p=-1(all，-3904表示除了阅读外，关闭其他所有权限

这样打印、复制的权限就会被所有者关闭

元数据

作者、关键字等，pypdf2中用pdfwriter这样做即可