how to deal with deprecating API functionality in python module?
Hi, I'm pretty new to python, I'm trying to figure out how a python module is supposed to make non-backwards-compatible changes without blowing up the applications that use it. In the C world this is straightforward, an application is linked against version X of the library, and if the library developers make a non-compatible change (remove a deprecated function, or change a function signature) they bump the version to X+1. Then versions X and X+1 can both be installed on the system at the same time and applications will link against whichever one they were compiled against. How would something like this work in a python application? I don't see any way to do the equivalent of import foo version X Is the only way to incorporate the version in the name? Like: import fooX Any guidance would be appreciated... Thanks, Chris -- https://mail.python.org/mailman/listinfo/python-list
python IDE and function definition
Hi all, I'm looking for a python IDE (for Linux) that can look at code like this: class ConductorManager(manager.Manager): def compute_recover(self, context, instance): self.compute_api.stop(context, instance, do_cast=False) where I could highlight the "stop" and ask it to go to the definition. (Where the definition is in a different file.) I'm running into issues where my current IDE (I'm playing with Komodo) can't seem to locate the definition, I suspect because it's too ambiguous. The fact that python is dynamically typed seems to mean that there could potentially be multiple answers, any class with a stop() method with the right signature could presumably be plausible, right? So rather than give up, I'd like to have my IDE suggest all possible answers. Chris -- https://mail.python.org/mailman/listinfo/python-list
Re: python IDE and function definition
On 09/23/2013 09:32 AM, Fabio Zadrozny wrote: On Mon, Sep 23, 2013 at 12:06 PM, Chris Friesen mailto:cbf...@mail.usask.ca>> wrote: Hi all, I'm looking for a python IDE (for Linux) that can look at code like this: class ConductorManager(manager.__Manager): def compute_recover(self, context, instance): self.compute_api.stop(context, instance, do_cast=False) where I could highlight the "stop" and ask it to go to the definition. (Where the definition is in a different file.) I'm running into issues where my current IDE (I'm playing with Komodo) can't seem to locate the definition, I suspect because it's too ambiguous. The fact that python is dynamically typed seems to mean that there could potentially be multiple answers, any class with a stop() method with the right signature could presumably be plausible, right? So rather than give up, I'd like to have my IDE suggest all possible answers. PyDev (http://pydev.org/) is able to do that (i.e.: if the find definition doesn't find it directly, it shows a list with possible matches for you to choose the most appropriate one: http://pydev.org/manual_adv_gotodef.html) -- additionally, you can also search for methods/classes/attributes directly: http://pydev.org/manual_adv_open_decl_quick.html I've installed eclipse/pydev and tried it out. The problem that I'm seeing is that it will show me *all* stop() methods that it knows about, regardless of function signature. So in the above case, my function call looks like: self.compute_api.stop(context, instance, do_cast=False) but pydev will offer matches that look like: def stop(self): This runs into problems with commonly-named functions. I tried searching for the start() method in: self.compute_api.start(context, instance) and it complained that there were too many possible results. Basically, I'm looking for something smart enough to throw out methods with the same name but that don't match the signature. Chris -- https://mail.python.org/mailman/listinfo/python-list
python function parameters, debugging, comments, etc.
I've got a fair bit of programming experience (mostly kernel/POSIX stuff in C). I'm fairly new to python though, and was hoping for some advice. Given the fact that function parameters do not specify types, when you're looking at someone else's code how the heck do you know what is expected for a given argument? (Especially in a nontrivial system where the parameter is just passed on to some other function and may not be evaluated for several nested function calls.) Is the recommendation to have comments for each function describing the expected args? I was trying to debug some stuff that someone else wrote. It turned out that the problem was in code like this: def rebuild_instance(self, context, instance, image, ...) request_spec = scheduler_utils.build_request_spec(context, image, [instance]) ...stuff... other_function(...,image,...) where build_request_spec looks like: def build_request_spec(ctxt, image, instances): ...etc... and it took me a while to realize that rebuild_instance() was being passed the image ID (basically just a string), and other_function() was expecting the image ID, but build_request_spec() was expecting the actual image dictionary. It also took me a while to realize that that build_request_spec() was expecting a list of instances, while rebuild_instance() was passing in a single instance. That one is already fixed in the above code. So what's the recommended way of dealing with stuff like this in larger projects with many developers? Thanks, Chris -- https://mail.python.org/mailman/listinfo/python-list
