i wanted to concatenate different number of .mp3 files, so this script provides such ability.

concat.py

import sys
from functools import reduce

def read(file):
    with open(file,"rb") as f:
        return f.read()

all_data = list(map(read,sys.argv[1:]))
concated = reduce(lambda a,b:a+b,all_data)
concated = concated

name = input("enter concated file name:")

with open(name,"wb") as f:
    f.write(concated)