Good advice - thanks for that. And I think you're right - I think what is happening is in fact a bunch of circular references. As I resolve issues, I will be looking for those! Appreciate all the advice!
On Jul 9, 2012, at 5:16 PM, Dave Angel wrote: > On 07/09/2012 11:56 AM, Chris Hare wrote: >> So, I have to admit, imports have me really confused. I am trying to break >> apart a 10,000+ line single file into various files, one for each class, and >> one containing a whole bunch of functions which are used by a lot of >> classes. Some of those functions use calls to methods in a Class. Even >> though the Class has been imported, I get a nameError where trying to use >> the class. I have read about Classes and packages and modules, but import >> just has me confused. > Something I haven't seen explicitly mentioned in this thread is that > when you make those modules to hold classes DO NOT make the module name > the same as the class name. > > If you have a class MyClass defined in your 10k file, and you want to > move it to a separate file, and if you really wanted to dedicate the > file to a single class, then the file might be called myclass.py and the > references to it would like something like: > > import myclass > ... > obj = myclass.MyClass(arg1, arg2) > > or alternatively, > > from myclass import MyClass > ... > obj = MyClass(arg1, arg2) > > You wouldn't believe how much confusion people get into when they have > module names that look like class names. > > > Another thing is that you probably want several related classes and > functions in each module. This is not Java. At that point, you might want > > from people import MyFirstPeopleClass, MySecondPeopleClass, peoplefunction > > > Finally, upon more careful reading of your original query, you may have > circular dependencies happening here. A function may use class methods, > and class methods may use the function. But if both are true, then put > them in the same module. Having one module import a second one which > imports the first is an invitation to disaster. And a special place in > debugging hell is reserved for those that try to import the script that > invokes it all. > > -- > > DaveA > _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
