tools to manipulate PDF document?

[wcc]

Hello group,

I wonder what tools/modules are avaible to manipulate PDF ducument,
i.e., merge, split, rotate page, crop, etc..  I checked the PyPI page
and seems the only one may fit the need is pyPdf.  But it is in its
early stage and currently only supports two functions: merge & split.
I suppose working with PDF document is a common task.  Just wanted to
know if there are other alternatives.  Thank you very much!

- wcc