argparse epilog call function?

[Didymus]

On Tuesday, June 27, 2017 at 11:47:42 AM UTC-4, Didymus wrote:
> On Tuesday, June 27, 2017 at 9:56:13 AM UTC-4, Didymus wrote:
> > Greetings,
> > 
> > I might be barking up the wrong tree, but was wondering if there's a way to have the argpasre epilog call a function. for example:
> > 
> > epilog=Examples()
> > 
> > Where Examples is:
> > 
> > def Examples():
> >     text = """Lots of examples"""
> >     print(text.format())
> > 
> > I've place this in and found that it prints out no matter if I use the -h or
> > not and also it prints first.... If I do:
> > 
> > epilog='Single Example'
> > 
> > it works as intended, unfortunately, I need to show several examples. Just wondering if someone has found a why to do this (without making a custom help).
> > 
> > thanks
> >   Tom
> Well, I thought I had a good idea to work around this by setting a string to the formatted text and then use that string in the epilog:
> 
> text = Example()
> #
> parser = argparse.ArgumentParser(prog=sys.argv[0],
> description="Example Arg Parse",
> epilog=text)
> 
> I had to change the Example function to return the string and in a print it works fine, however when used in the argsparse, the formatting is lost...
> 
> -T

Greetings,

I got what I was looking for:

def Examples():
    text = """Lots of examples"""
    return text.format()

parser = argparse.ArgumentParser(prog=sys.argv[0],
formatter_class=argparse.RawTextHelpFormatter,
description="Argparse Example",
epilog=text)

The key here is the "formatter_class=argparse.RawTestHelpFormatter". Once I set that the epilog prints out nicely formatted:

% ./test.py -h               
usage: ./test.py [-h] [-n NAME] [-f | -m | -r | -v]                 

Argparse Example.

optional arguments:
  -h, --help            show this help message and exit
  -n NAME, --name NAME  Name to be created.

Examples:
        Ex 1:
        ./test.py -n juser

        Ex 2:
        ./test.py -n juser -r

...

Thanks for all the help.
 -Tom