URL - https://docs.python.org/3/howto/argparse.html

The following code will return a type error:

import argparse
parser = argparse.ArgumentParser()
parser.add_argument("square", help="display a square of a given number")
args = parser.parse_args()
print(args.square**2)

This should be changed to:

import argparse
parser = argparse.ArgumentParser()
parser.add_argument("square", help="display a square of a given number")
args = parser.parse_args()
print(int(args.square)**2)

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If you read the text afterwards, you'll see that raising a TypeError was the intended purpose of this example.  Just afterward, it shows how to use *type* to make the code correct.