把pdf文档的每一页单独存为pdf文档

from  PyPDF2  import  PdfFileWriter,PdfFileReader
n=1
读pdf=PdfFileReader(r"E:pdfpython.pdf")
for  page  in  range(0,读pdf.getNumPages()):
    写pdf=PdfFileWriter()
    写pdf.addPage(读pdf.getPage(page))
    with  open(r"E:pdf{}.pdf".format(n),"wb")  as  f:
        n+=1
        写pdf.write(f)