Porting in Python3: PyPDF2 mergePage () gives TypeError

Question

I am using Python 3.4.2 and PyPDF2 1.24 (also using reportlab 3.1.44 in case this helps) on Windows 7.

I recently upgraded from Python 2.7 to 3.4 and am currently porting my code. This code is used to create an empty pdf page with links embedded in it (using reportlab) and merging (using PyPDF2) with an existing pdf page. I had a problem with reportlab that saving the canvas used StringIO, which had to be changed to BytesIO, but after that I ran into this error:

Traceback (most recent call last):
File "C:\cms_software\pdf_replica\builder.py", line 401, in merge_pdf_files
    input_page.mergePage(link_page)
File "C:\Python34\lib\site-packages\PyPDF2\pdf.py", line 2013, in mergePage
    self.mergePage(page2)
File "C:\Python34\lib\site-packages\PyPDF2\pdf.py", line 2059, in mergePage
    page2Content = PageObject._pushPopGS(page2Content, self.pdf)
File "C:\Python34\lib\site-packages\PyPDF2\pdf.py", line 1973, in _pushPopGS
    stream = ContentStream(contents, pdf)
File "C:\Python34\lib\site-packages\PyPDF2\pdf.py", line 2446, in __init
    stream = BytesIO(b_(stream.getData()))
File "C:\Python34\lib\site-packages\PyPDF2\generic.py", line 826, in getData
    decoded._data = filters.decodeStreamData(self)
File "C:\Python34\lib\site-packages\PyPDF2\filters.py", line 326, in decodeStreamData
    data = ASCII85Decode.decode(data)
File "C:\Python34\lib\site-packages\PyPDF2\filters.py", line 264, in decode
    data = [y for y in data if not (y in ' \n\r\t')]
File "C:\Python34\lib\site-packages\PyPDF2\filters.py", line 264, in 
    data = [y for y in data if not (y in ' \n\r\t')]
TypeError: 'in <string>' requires string as left operand, not int

Here is the line and line above where the trace is mentioned:

link_page = self.make_pdf_link_page(pdf, size, margin, scale_factor, debug_article_links)
if link_page != None:
input_page.mergePage(link_page)

Here are the relevant parts of this make_pdf_link_page function:

packet = io.BytesIO()
can = canvas.Canvas(packet, pagesize=(size['width'], size['height']))
....# left out code here is just reportlab specifics for size and url stuff
can.linkURL(url, r1, thickness=1, color=colors.green)
can.rect(x1, y1, width, height, stroke=1, fill=0)
# create a new PDF with Reportlab that has the url link embedded
can.save()
packet.seek(0)
try:
    new_pdf = PdfFileReader(packet)
except Exception as e:
    logger.exception('e')
    return None
return new_pdf.getPage(0)

, BytesIO, reportlab StringIO. , Python 2.7, . !

UPDATE: BytesIO , . , . tempfile:

import tempfile
temp_dir = tempfile.gettempdir()
temp_path = os.path.join(temp_dir, "tmp.pdf")
can = canvas.Canvas(temp_path, pagesize=(size['width'], size['height']))
....
can.showPage()
can.save()
try:
    new_pdf = PdfFileReader(temp_path)
except Exception as e:
    logger.exception('e')
    return None
return new_pdf.getPage(0)

UPDATE: . , can.rect can.linkURL, . , - , pdf, .

Answer 1

PyPDF2 . python 3 . , python 3, . ASCII85Decode filters.py PyPDF2. python 3 . pdfminer3k, python 3 pdfminer. ASCII85Decode() , :

import struct
class ASCII85Decode(object):
    def decode(data, decodeParms=None):
        if isinstance(data, str):
            data = data.encode('ascii')
        n = b = 0
        out = bytearray()
        for c in data:
            if ord('!') <= c and c <= ord('u'):
                n += 1
                b = b*85+(c-33)
                if n == 5:
                    out += struct.pack(b'>L',b)
                    n = b = 0
            elif c == ord('z'):
                assert n == 0
                out += b'\0\0\0\0'
            elif c == ord('~'):
                if n:
                    for _ in range(5-n):
                        b = b*85+84
                    out += struct.pack(b'>L',b)[:n-1]
                break
        return bytes(out)