[Python-ideas] Syntax to import modules before running command from the command line
barry at python.org
Tue Jan 9 16:54:52 EST 2018
Steve Barnes wrote:
> Currently invoking `python -c "some;separated;set of commands;"` will,
> if you need to use any library functions, require one or more import
> somelib; sections in the execution string. This results in rather
> complex "one liners".
> On the other hand `python -m somelib` will load somelib and attempt to
> execute its `__main__()` or give an error if there isn't one.
> What I would like to suggest is a mechanism to pre-load libraries before
> evaluating the -c option as this would allow the use of code from
> libraries that don't have a `__main__` function, or those that do but it
> doesn't do what you want.
It would be really cool if you could somehow write a file with a bunch
of commands in it, and then get Python to execute those commands. Then
it could still be a one line invocation, but you could do much more
complex things, including import a bunch of modules before executing
some code. I'm not sure what such a file would look like but here's a
path = somelib.get_path()
parent = os.path.dirname(path)
sys.exit(0 if os.path.isdir(parent) else 1)
Then you could run it like so:
$ python3 myscript.py
That seems like a nice, compact, one line invocation, but cI don't know,
it probably needs some fleshing out. It's just a crazy idea, and
there's probably not enough time to implement this for Python 3.7.
Maybe for Python 3.8.
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