Can someone please explain why I get this error message in my python program? And explain how to fix it. Thank You!

import sys import stdio

stdio.write('Hi, ') stdio.write(sys.argv[1]) stdio.writeln('. How are you?')

Traceback (most recent call last): Hi, File "/Users/Desktop/Python/userargument.py", line 6, in stdio.write(sys.argv[1]) IndexError: list index out of range [Finished in 0.1s with exit code 1]