Print program usage example with argparse module

问题

I am trying to learn how to use python's argparse module. Currently my python script is:

parser = argparse.ArgumentParser(description='My first argparse attempt',
                                add_help=True)
parser.add_argument("-q", action ="store", dest='argument',
                    help="First argument")
output = parser.parse_args()

And it gives the output as :

usage: test.py [-h] [-q ARGUMENT]

My first argparse attempt

optional arguments:
  -h, --help   show this help message and exit
  -q ARGUMENT  First argument

Now, lets suppose I want my -h or --help argument to print a usage example also. Like,

   Usage: python test.py -q "First Argument for test.py"

My purpose is to print the above usage example along with the default content of -h argument so that the user can get a basic idea of how to use the test.py python script.

So, is this functionality inbuilt in the argparse module. If no than what is the correct way to approach this problem.

回答1:

Use parser.epilog to display something after the generated -h text.

parser = argparse.ArgumentParser(
    description='My first argparse attempt',
    epilog='Example of use')

output = parser.parse_args()

prints:

My first argparse attempt

optional arguments:
  -h, --help  show this help message and exit

Example of use

来源：https://stackoverflow.com/questions/10930635/print-program-usage-example-with-argparse-module