Binary search in Txt file with line format: ID | any | any

search_binary.py

import sys

def binary_search_in_file(file_name, desired_element):
    start = 0
    end = None
    with open(file_name, 'r') as file:
        file_size = file.seek(0, 2)
        end = file_size

        while start <= end:
            middle = (start + end) // 2

            file.seek(middle)
            file.readline()

            line_raw = file.readline().strip()
            line = line_raw.split('|')[0]
            if not line:
                break  # End of file

            value = int(line)  # Assuming IDs are integers

            if value == desired_element:
                return line_raw
            elif value < desired_element:
                start = middle + len(line) + 1
            else:
                end = middle - 1

    return False

if len(sys.argv) != 3:
    print("Usage:\n python3 search_binary.py file_name.txt unique_number\n")
else:
    file_name = sys.argv[1]
    desired_element = int(sys.argv[2])
    founded = binary_search_in_file(file_name, desired_element)
    if founded:
        print(founded)
    else:
        print(f"The element {desired_element} was not found in the file.")

file_name.txt
1 | anything in first line | other | ...
3 | anything in second line | other | ...
4 | anything in third line | other | ...