Removed the arch option and switched to context.binary and pack

func_addr.py

#!/usr/bin/env python3

'''
pip3 install pwntools
pip3 install argparse
'''

from pwn import *
from sys import argv, stderr, stdout
import argparse

context.log_level = 'error'

my_parser = argparse.ArgumentParser(description='A Python3 Based Binary Function Address Extractor using PWNTOOLS by @TheFlash2k')
my_parser.add_argument(
	'--binary',
	'-b',
	metavar='bin',
	type=str,
	help='The name of the binary from which the function is to be extracted',
	required=True,
)
my_parser.add_argument(
	'--func',
	'-f',
	metavar='func',
	type=str,
	help='The name of the function that is to be extracted from the binary',
	required=True,
)

args = my_parser.parse_args()
binary_name = args.binary
func_name = args.func

e = context.binary = ELF(binary_name)
try:
	addr = e.symbols[func_name]
except KeyError:
	print("Invalid function name!", file=stderr)
	exit(1)
	
val = pack(addr)
print(f"Address of {func_name}: {val}")