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 dictionaries, then multiple lists which contains multiple dictionaries.

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

```

This pattern repeats multiple times.

**Expected output:** The output should look like this

```
1 Title Goes Here
   1.1 Title Goes Here
       1.1.1 Title Goes Here
       1.1.2 Title Goes Here
       1.1.3 Title Goes Here
   1.2 Title Goes Here
       1.2.1 Title Goes Here
       1.2.2 Title Goes Here
       1.2.3 Title Goes Here
   1.3 Title Goes Here
       1.3.1 Title Goes Here
       1.3.2 Title Goes Here
       1.3.3 Title Goes Here

2 Title Goes Here
   2.1 Title Goes Here
       2.1.1 Title Goes Here
       2.1.2 Title Goes Here
       2.1.3 Title Goes Here
   2.2 Title Goes Here
       2.2.1 Title Goes Here
       2.2.2 Title Goes Here
       2.2.3 Title Goes Here
   2.3 Title Goes Here
       2.3.1 Title Goes Here
       2.3.2 Title Goes Here
       2.3.3 Title Goes Here

```

**Program:**

```py
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](http://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.