# Rotate PDF

## Demo

* Needs: rotate each pdf file clockwise 90 degree after changing from ps file
* Before: ![](https://i.niupic.com/images/2021/01/07/98n5.png)
* After: ![](https://i.niupic.com/images/2021/01/07/98n6.png)

```python
import os
from PyPDF2 import PdfFileReader, PdfFileWriter
for i in os.listdir(os.getcwd()):
    if 'ps2pdf' in i:
        continue
    if 'ps' in i:
        os.system("pstopdf "+i)
        pdffile = i.split('.ps', 1)[0]+".pdf"
        print (pdffile)
        pdf_writer = PdfFileWriter()
        with open(pdffile, 'rb') as fh:
            pdf_reader = PdfFileReader(fh)
            print(pdf_reader.getNumPages())
            page = pdf_reader.getPage(0).rotateClockwise(90)
            pdf_writer.addPage(page)
            with open("rotate_"+pdffile, 'wb') as f:
                pdf_writer.write(f)
```

Reference: 1. [How to Work With a PDF in Python](https://realpython.com/pdf-python/) 2. [python操作PDF------旋转及排序pdf](https://www.cnblogs.com/nanamiyi/p/13615681.html)