[Solved] What is the error in following python code

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First things first, I think the code you originally posted (with Hello(sys.argv[0])) is not what you actually have. It doesn’t match the error, which states sys.argv[1], so what you probably have is:

def main():
    Hello(sys.argv[1])

As to the error then, it’s because you haven’t provided an argument when running. You need to do so, such that sys.argv[1] exists:

python helloprog Pax

You would find a more robust main as:

def main():
    if len(sys.argv) < 2:
        Hello("whoever you are")
    else:
        Hello(sys.argv[1])

which will detect when you haven’t provided an argument, and use a suitable default rather than raising an exception.

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solved What is the error in following python code