PdfReadWarning: PdfFileReader stream/file object is not in binary mode

Question

I have many pdf pages that I want to merge them into one file.

My script is as follow:

from PyPDF2 import PdfFileMerger,PdfFileReader
filename_list=[]
merger = PdfFileMerger()
for i in range (0,66):
    filename='page'+str(i)+'.pdf'
    if not filename in filename_list:
        filename_list.append(filename)
for filename in filename_list:
    merger.append(PdfFileReader(open(filename),'rb'))
merger.write('output.pdf')

When I ran it, it gave me the warning "PdfReadWarning: PdfFileReader stream/file object is not in binary mode. It may not be read correctly. [pdf.py:792]"

I'm not sure why it is doing that. Can anyone have any suggestions? (I used pypdf2)

Very much appreciated!

I found my mistake. It should be merger.append(PdfFileReader(open(filename,'rb')) — mikayla, Apr 01 '14 at 06:40
You should just give the filename directly to the PdfFileReader - or pass a file handle which you **close** yourself! — Martin Thoma, May 14 '22 at 12:12

score 17 · Answer 1 · answered Aug 28 '15 at 16:11

17

'rb' should be on "open", not PdfFileReader.

merger.append(PdfFileReader(open(filename, 'rb')))

answered Aug 28 '15 at 16:11

Collin Anderson

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You sir, are a genius! – Tahlor Feb 16 '17 at 16:40

PdfReadWarning: PdfFileReader stream/file object is not in binary mode

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