How to print out a value in a dictionary then values is a list?

Area of coding: PDF Table of Contents in python3 using pyPDF2

Problem: I need a program that can iterate through a union variable that contains multiple dictionarys, then multiple lists which contains multiple dictionarys.

{}

[{},[{},{},{}],{},[{},{},{}],{},[{},{},{}]]

This pattern repeats multiple times.

Expected output: The output should look like this

1 Title Goes Here
   1.1 Title Goes Here
   1.2 Title Goes Here
   1.3 Title Goes Here

2 Title Goes Here
   2.1 Title Goes Here
   2.2 Title Goes Here
   2.3 Title Goes Here

Program:

"""
Program finds the Table of Contents(ToC) of a pdf file
Then prints it out in the format

    1
      1.1
      1.2
      1.3

    2
      2.1
      2.2
      2.3

"""

import argparse as arp
from PyPDF2 import PdfFileReader

parser = arp.ArgumentParser()
parser.add_argument("-f", "--file", help="File to analyse")
arg = parser.parse_args()
filename = arg.file


def fileread():
    doc = PdfFileReader(filename)
    ToC = doc.getOutlines()

    # ToC: Union[List[Union[Destination, list]], {__eq__}] = doc.getOutlines()

    for elements in ToC:
        #print(elements)
        #print("\n")

        try:
            if elements is {}: # If the element is a dictionary just find the Title
                print(elements['/Title']) # TODO: This is just skipped 

            else: # If the element is a list go through and print out the titles
                for nest_dict in elements:
                    try:
                        print(nest_dict["/Title"])
                    except:
                        continue
        except:
            continue

fileread()

I’m testing this program on: Compilers – Principles, Techniques, and Tools-Pearson_Addison Wesley (2006).pdf (ce.sharif.edu/courses/94-95/1/ce414-2/resources/root/Text%20Books/Compiler%20Design/Alfred%20V.%20Aho,%20Monica%20S.%20Lam,%20Ravi%20Sethi,%20Jeffrey%20D.%20Ullman-Compilers%20-%20Principles,%20Techniques,%20and%20Tools-Pearson_Addison%20Wesley%20(2006).pdf)

Any help is much appreciated.

>Solution :

This line is not right:

        if elements is {}: # If the element is a dictionary just find the Title

It should instead read:

        if isinstance(elements, dict):