On 2024-09-21 at 06:38:05 +0100, Barry via Python-list <python-list@python.org> wrote:
> > On 20 Sep 2024, at 21:01, Loris Bennett via Python-list > > <python-list@python.org> wrote: > > > > Hi, > > > > Apologies if the following description is to brief - I can expand if no > > one knows what I'm on about, but maybe a short description is enough. > > > > I am developing a command line application using Typer. Most commands > > need to do something in a database and also do LDAP stuff. Currently > > each command creates its own Database and LDAP objects, since each > > command forms an entry point to the program. > > > > With Typer, is there a way I can define the equivalent of class > > attributes at a single point which are then available to all commands? > > I do not know typer. But the general solution is to create an instance of > your class > and tell typer to call member function of the instance. > > app = Application() > … > typer.set_callback(app.my_handler) Despite the fact that "everything is an object" in Python, you don't have to put data or functions inside classes or objects. I also know nothing about Typer, but there's nothing wrong with functions in a module. There's also nothing wrong with writing a function that creates and returns the database and LDAP connections (perhas as instances of application-level classes), amd calling that function from within each command. DRY. Yeah, yeah, yeah. :-/ So there's one line at the top of each comamnd that initializes things, and possibly a line at the bottom to close those things down. Turn those lines into a context manager, which is actually a sub-framework inside Typer. Don't convolute/compilicate your design to eliminate one line at the top of each command. Go ahead, accuse me of writing FORTRAN (all caps, no numbers or qualifiers, as $deity intended) in Python. But neither optimize prematurely nor invoke the Inner Platform Effect to save one or two lines in your not-yet-written commands, either. Sorry for the rant. :-) Simple is better than complex. Complex is better than complicated. HTH. -- https://mail.python.org/mailman/listinfo/python-list
