On 2020-10-22 at 20:04:14 -0400,
Michael Smith <mich...@smith-li.com> wrote:
> 1. Being able to call two different functions from the same module. (AND)
> 2. Being able to call some functions that exist today without modification
> or rearrangement. (AND)
> 3. Being able to invoke these things from python without installing a
> module from pip.
>
> There are solutions that do some of these, but nothing that does them all.
> I think it's surprising that the python makers have found worthwhile three
> different solutions for invoking modules, but this list so far has seen
> little value in invoking a function.
The following module meets your three criteria:
%% begin Python code
def f():
print("This is f.")
def g():
print("This is g.")
h = 'hello'
i = lambda x: print(f"Hello, {x}.")
if __name__ == '__main__':
import sys
try:
function_name, *arguments = sys.argv[1:]
except (IndexError, ValueError):
print('missing function name')
sys.exit(1)
function = sys.modules[__name__].__dict__.get(function_name)
if not function or not callable(function):
print('cannot find or cannot call', function_name)
sys.exit(1)
function(*arguments)
%% end Python code
It's not polished, and it only handles positional string parameters, but
it should be fairly self-explanatory. The __name__ == '__main__' idiom
allows the module to be imported by other modules without incident.
IMO, at best, it might be the beginning of a recipe somewhere rather
than being included in the standard library. I agree with David Mertz
that as soon as it gets more complex, every application is going to want
something a little different.
> It would definitely be more empowering to be able to describe the
> command line args to such an invocation using the args to the
> function.
Such enhancements are left as an exercise to the interested reader.
HTH,
Dan
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