Off topic:path to a directory as argparse argument

Question

[ahmedakhokhar]

Problem: I want a write a directory's path as user's input in an add.argument of ArgumentParser().

So far: I have written this

import argparse

parser = argparse.ArgumentParser()
parser.add_argument('path', option = os.chdir(input("paste here path to biog.txt file:")), help= 'paste path to biog.txt file')

Any idea's, what would be the ideal solution of this problem ?