marge all pdf files and delete cover page in each file

editpdf.py

from PyPDF2 import PdfFileWriter, PdfFileReader
import os

def merge_and_delete(files):
    output = PdfFileWriter()
    outpages = 0
    for file in files:
        path = os.path.join("book", file)
        print(path)
        input1 = PdfFileReader(open(path, 'rb'))
        pages = input1.getNumPages()
        for i in range(pages):
            if i == 0:
                continue
            output.addPage(input1.getPage(i))
            outpages += 1
        output.addBookmark(title=file[:-4], pagenum=outpages-pages + 1)
    pages = output.getNumPages()

    outputStream = open("PyPDF2-output.pdf", "wb")
    output.write(outputStream)

if __name__ == '__main__':
    files = sorted(
            [f for f in os.listdir("book") if f.endswith(".pdf")]
        )
    merge_and_delete(files)