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+---- Thread: [Python] very strange issue with python lists and dict's i need help with this, explenatio (/showthread.php?tid=6054627)
very strange issue with python lists and dict's i need help with this, explenatio - degado - Mar 4, 2020
Hello people, I have python programming problem with lists. I am trying to write a script that extracts the bookmark names. I am using PyPDF3 for this to work.
Help me out if you can
so, in its raw form the PyPDF3 returns me the following structure from the pdf.
{'/Title': 'Preface', '/Page': IndirectObject(45, 0), '/Type': '/XYZ', '/Left': <PyPDF3.generic.NullObject object at 0x00000181E2030E48>, '/Top': 576, '/Zoom': <PyPDF3.generic.NullObject object at 0x00000181E2030F60>}
[{'/Title': 'Mission', '/Page': IndirectObject(51, 0), '/Type': '/XYZ', '/Left': <PyPDF3.generic.NullObject object at 0x00000181E2030FD0>, '/Top': 349.12354, '/Zoom': <PyPDF3.generic.NullObject object at 0x00000181E203D0F0>}, {'/Title': 'Review', '/Page': IndirectObject(55, 0), '/Type': '/XYZ', '/Left': <PyPDF3.generic.NullObject object at 0x00000181E203D160>, '/Top': 367.72357, '/Zoom': <PyPDF3.generic.NullObject object at 0x00000181E203D278>}, {'/Title': 'Conventions Used in This Book', '/Page': IndirectObject(55, 0), '/Type': '/XYZ', '/Left': <PyPDF3.generic.NullObject object at 0x00000181E203D2E8>, '/Top': 192.3996, '/Zoom': <PyPDF3.generic.NullObject object at 0x00000181E203D400>}, {'/Title': 'Using Code Examples', '/Page': IndirectObject(65, 0), '/Type': '/XYZ', '/Left': <PyPDF3.generic.NullObject object at 0x00000181E203D470>, '/Top': 228.42026, '/Zoom': <PyPDF3.generic.NullObject object at 0x00000181E203D588>}, {'/Title': 'Safari® Books Online', '/Page': IndirectObject(78, 0), '/Type': '/XYZ', '/Left': <PyPDF3.generic.NullObject object at 0x00000181E203D5C0>, '/Top': 430.72357, '/Zoom': <PyPDF3.generic.NullObject object at 0x00000181E203D710>}, {'/Title': 'How to Contact Us', '/Page': IndirectObject(96, 0), '/Type': '/XYZ', '/Left': <PyPDF3.generic.NullObject object at 0x00000181E203D780>, '/Top': 581.32361, '/Zoom': <PyPDF3.generic.NullObject object at 0x00000181E203D860>}]
the output is bigger, but it is sufficient for illustration purposes
so as we can see it returns a dict or a arrys of dicts depending if the bookmarks are stored in the multi level
1
2
3
3.1
3.2
etc
I want to print them all out in the list so there is my attempt below, but it does not work correctly I susspect it something wrong with the loop, can’t get this to work,
from PyPDF3 import*
pdf_input = PdfFileReader(open("test.pdf", "rb"))
pdf_output = PdfFileWriter()
pdf_bookmarks = pdf_input.getOutlines(node=None, outlines=None)
bookmark_name = "/Title"
bookmark_list = []
for count1 in range(pdf_bookmarks.__len__()):
if isinstance(pdf_bookmarks[count1], dict):
bookmark_sub = False
bookmark_list.append(pdf_bookmarks[count1][bookmark_name])
print(pdf_bookmarks[count1][bookmark_name])
print("l1")
if isinstance(pdf_bookmarks[count1], list):
bookmark_sub = True
for count2 in range(pdf_bookmarks[count1].__len__()):
bookmark_list.append(pdf_bookmarks[count1][count2][bookmark_name])
print(pdf_bookmarks[count1][count2][bookmark_name])
print("l2")
if isinstance(pdf_bookmarks[count1][count2], list):
for count3 in range(pdf_bookmarks[count1][count2].__len__()):
bookmark_list.append(pdf_bookmarks[count1][count2][count3][bookmark_name])
print(pdf_bookmarks[count1][count2][count3][bookmark_name])
print("l3")
if isinstance(pdf_bookmarks[count1][count2][count3], list):
for count4 in range(pdf_bookmarks[count1][count2][count3].__len__()):
bookmark_list.append(pdf_bookmarks[count1][count2][count3][count4][bookmark_name])
print(pdf_bookmarks[count1][count2][count3][count4][bookmark_name])
print("l4")
if isinstance(pdf_bookmarks[count1][count2][count3][count4], list):
for count5 in range(pdf_bookmarks[count1][count2][count3][count4].__len__()):
bookmark_list.append(pdf_bookmarks[count1][count2][count3][count4][count5][bookmark_name])
print(pdf_bookmarks[count1][count2][count3][count4][count5][bookmark_name])
print("l5")
for bookmark_counter in range(bookmark_list.__len__()):
print(bookmark_list[bookmark_counter])
output
Microsoft Windows [Version 10.0.17763.1039]
© 2018 Microsoft Corporation. All rights reserved.
D:\python\projects\pdf-tool>python pdf-helpper.py
Copyright
l1
Table of Contents
l1
Foreword
l1
Preface
l1
Mission
l2
Review
l2
Conventions Used in This Book
l2
Using Code Examples
l2
Safari® Books Online
l2
How to Contact Us
l2
Chapter 1. ES? Now & Future
l1
Versioning
l2
Transpiling
l2
Traceback (most recent call last):
File "pdf-helpper.py", line 19, in <module>
bookmark_list.append(pdf_bookmarks[count1][count2][bookmark_name])
TypeError: list indices must be integers or slices, not str
You see my pdf that i am testing with has mor then 2 bookmark sublevels, and it get's stuck when trying to read the third level
I have a suspicion that I am not accessing lists correctly
Thanks for help
l1, l2 etc text is the indicator on which loop it gets stuck for debug Purposes only.
Thanks for help
RE: very strange issue with python lists and dict's i need help with this, explenatio - h0lyl337 - Mar 4, 2020
one of those indexes are coming back as str instead of an int. Convert it into an int.
RE: very strange issue with python lists and dict's i need help with this, explenatio - degado - Mar 5, 2020
(Mar 4, 2020 03:15 PM)h0lyl337 Wrote: one of those indexes are coming back as str instead of an int. Convert it into an int.I am using array length to go through the loop and there are no strings involved accept the actual bookmark names of course.
it works for 1st and 2nd level bookmars but does not for 3rd so it is not the str issue.
i checked the index with the folowing staitment
if isinstance(pdf_bookmarks[count1][count2], str):
print("string")
it is all good