Python scope / namespace issue?

This one works fine without complicating your code: funcs. Py import classes def func(): d = classes.D() print "func" if __name__ == "__main__": c = classes.C() classes. Py import funcs class C: def __init__(self): print "C class" funcs.func() class D: def __init__(self): print "D class Sometimes it's much better to use simple import, than from ... import There is quite good article on that: effbot.org/zone/import-confusion.htm.

This one works fine without complicating your code: ///funcs. Py import classes def func(): d = classes.D() print "func" if __name__ == "__main__": c = classes.C() ///classes. Py import funcs class C: def __init__(self): print "C class" funcs.func() class D: def __init__(self): print "D class" Sometimes it's much better to use simple import, than from ... import .... There is quite good article on that: effbot.org/zone/import-confusion.htm.

The problem occurs due to the attempt to use a cyclically imported module during module initialization. To clarify, using the "from module use *" requires that a module be compiled. Instead if you switch to using "import module" in both cases, it should work fine.

1 "requires that a module be compiled" is misleading at best. The module code is loaded, compiled and run either way. But from m import * copies everything that's in the module at that point in time while import m gives a reference to the module object - and hence makes later modifications visible.

– delnan Aug 29 at 10:18.

Namespace collision happens when the new Attribute will require two different namespace URLs wit the same prefix to be in scope for an Element. Setting an attribute position to a new attribute may cause a namespace collision if the new attribute has the same prefix, but different URL, as an existing item in the Element. But, if the only collision is with the attribute that is being replaced, then there is no collision.... but the current checkNamespaceCollision does not take the replaceing-the-collision-attribute in to consideration, and it should.

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