Re: caught in the import web again

2014-11-18 Thread Charles T. Smith
On Tue, 18 Nov 2014 00:00:42 -0700, Michael Torrie wrote: On 11/17/2014 03:45 PM, Steven D'Aprano wrote: Circular dependencies are not just a problem in Python, they are a problem throughout most of software design. Personally I find that duck typing eliminates a lot of the circular

Re: caught in the import web again

2014-11-18 Thread Ian Kelly
On Mon, Nov 17, 2014 at 6:20 PM, Dave Angel da...@davea.name wrote: Ian Kelly ian.g.ke...@gmail.com Wrote in message: On Mon, Nov 17, 2014 at 3:17 PM, Dave Angel da...@davea.name wrote: In a module that might get tangled in a cycle, avoid global code that depends on other modules. Instead

Re: caught in the import web again

2014-11-18 Thread Dave Angel
Ian Kelly ian.g.ke...@gmail.com Wrote in message: On Mon, Nov 17, 2014 at 6:20 PM, Dave Angel da...@davea.name wrote: Ian Kelly ian.g.ke...@gmail.com Wrote in message: On Mon, Nov 17, 2014 at 3:17 PM, Dave Angel da...@davea.name wrote: In a module that might get tangled in a cycle, avoid

Re: caught in the import web again

2014-11-18 Thread Chris Angelico
On Wed, Nov 19, 2014 at 6:09 AM, Dave Angel da...@davea.name wrote: I once worked on (and then fixed) a build system that could not complete a build from clean. It needed some pieces from a previous build in order to get to the point where it was ready to build those pieces. Recursive

Re: caught in the import web again

2014-11-18 Thread Dave Angel
Chris Angelico ros...@gmail.com Wrote in message: On Wed, Nov 19, 2014 at 6:09 AM, Dave Angel da...@davea.name wrote: I once worked on (and then fixed) a build system that could not complete a build from clean. It needed some pieces from a previous build in order to get to the point where

Re: caught in the import web again

2014-11-17 Thread Charles T. Smith
On Mon, 17 Nov 2014 08:08:40 +0100, dieter wrote: Charles T. Smith cts.private.ya...@gmail.com writes: ... Are others equally frustrated by this or is there a trick or principle that I'm missing. At this point, I guess the way I'll have to proceed is to put every class in its own file, no

Re: caught in the import web again

2014-11-17 Thread Dave Angel
Charles T. Smith cts.private.ya...@gmail.com Wrote in message: Well, I guess that's the definitive answer... the tips for delaying import are good, I'll try to leverage them. I was hoping there would be a way to have python postpone evaluation similar to C's forward references. In a

Re: caught in the import web again

2014-11-17 Thread Steven D'Aprano
Charles T. Smith wrote: Yes, we're talking about recursive imports here. It's a complex, object- oriented system with big classes and little classes that are strongly interrelated. Well, there's your problem right there. You're working with a complex, highly coupled code-base. Alarms bells

Re: caught in the import web again

2014-11-17 Thread Ian Kelly
On Mon, Nov 17, 2014 at 3:17 PM, Dave Angel da...@davea.name wrote: Charles T. Smith cts.private.ya...@gmail.com Wrote in message: Well, I guess that's the definitive answer... the tips for delaying import are good, I'll try to leverage them. I was hoping there would be a way to have python

Re: caught in the import web again

2014-11-17 Thread Dave Angel
Ian Kelly ian.g.ke...@gmail.com Wrote in message: On Mon, Nov 17, 2014 at 3:17 PM, Dave Angel da...@davea.name wrote: In a module that might get tangled in a cycle, avoid global code that depends on other modules. Instead of putting such initialization at top level, put inside a function

Re: caught in the import web again

2014-11-17 Thread Rick Johnson
On Monday, November 17, 2014 4:46:05 PM UTC-6, Steven D'Aprano wrote: [...] Python is not Java, nor Perl, and if you're putting every class into its own file, you are doing it wrong. Stop making these gross generalizations. Just because Java *REQUIRES* that you only have one class per file

Re: caught in the import web again

2014-11-17 Thread Chris Angelico
On Tue, Nov 18, 2014 at 1:17 PM, Rick Johnson rantingrickjohn...@gmail.com wrote: BOY I LOVE TROGGING! For consistency, you should say GOVE there. ChrisA -- https://mail.python.org/mailman/listinfo/python-list

Re: caught in the import web again

2014-11-17 Thread Michael Torrie
On 11/17/2014 03:45 PM, Steven D'Aprano wrote: Circular dependencies are not just a problem in Python, they are a problem throughout most of software design. Personally I find that duck typing eliminates a lot of the circular dependency problems. Class A doesn't necessarily have to know about

Re: caught in the import web again

2014-11-17 Thread Steven D'Aprano
On Mon, 17 Nov 2014 18:17:13 -0800, Rick Johnson wrote: BOY I LOVE TROGGING! Yes, we've noticed. http://www.urbandictionary.com/define.php?term=trogging -- Steven -- https://mail.python.org/mailman/listinfo/python-list

Re: caught in the import web again

2014-11-16 Thread Charles T. Smith
On Sun, 16 Nov 2014 08:14:05 +0100, dieter wrote: Charles T. Smith cts.private.ya...@gmail.com writes: Now, I'm getting these errors: ImportError: cannot import name ... and AttributeError: 'module' object has no attribute ... (what is 'module'?) Is there a way to resolve this

Re: caught in the import web again

2014-11-16 Thread Chris Angelico
On Sun, Nov 16, 2014 at 7:53 PM, Charles T. Smith cts.private.ya...@gmail.com wrote: Yes, we're talking about recursive imports here. It's a complex, object- oriented system with big classes and little classes that are strongly interrelated. I can get the imports configured properly so

Re: caught in the import web again

2014-11-16 Thread dieter
Charles T. Smith cts.private.ya...@gmail.com writes: ... Are others equally frustrated by this or is there a trick or principle that I'm missing. At this point, I guess the way I'll have to proceed is to put every class in its own file, no matter how small. Hopefully that takes care of

Re: caught in the import web again

2014-11-15 Thread Ben Finney
Charles T. Smith cts.private.ya...@gmail.com writes: Now, I'm getting these errors: Please reduce the problem to a minimal, complete example demonstrating the behaviour URL:http://sscce.org/ so that you can show us exactly what's happening. AttributeError: 'module' object has no attribute

Re: caught in the import web again

2014-11-15 Thread Denis McMahon
On Sat, 15 Nov 2014 22:52:33 +, Charles T. Smith wrote: Now, I'm getting these errors: ImportError: cannot import name ... and AttributeError: 'module' object has no attribute ... It would be useful to know what you're actually trying to import and what the complete error

Re: caught in the import web again

2014-11-15 Thread dieter
Charles T. Smith cts.private.ya...@gmail.com writes: Now, I'm getting these errors: ImportError: cannot import name ... and AttributeError: 'module' object has no attribute ... (what is 'module'?) Is there a way to resolve this without having to restructure my code every couple of