[IronPython] Problems with Imports

[Michael Foord]

Dino Viehland wrote:
> Thanks for reporting this.  I've opened bug #9066 to track this.  If you don't need to add custom runtime behavior to the objects as a work around you could create a new module using imp.new_module and push the values into there.  I'm marking this as a v2.0 bug but if it's blocking you let me know.
>   
The second example is our workaround. :-)

Thanks

Michael
http://www.voidspace.org.uk/ironpython/


> On the 2nd example you might want to try using a type other than sys as the module type.  Sys is a little special in IronPython.
>
> -----Original Message-----
> From: users-bounces at lists.ironpython.com [mailto:users-bounces at lists.ironpython.com] On Behalf Of Michael Foord
> Sent: Wednesday, March 21, 2007 7:02 AM
> To: Discussion of IronPython
> Subject: [IronPython] Problems with Imports
>
> Hello all,
>
> We do see some differences between the way IronPython and CPython
> resolve imports. (Tested with IP 1.0.1 I'm afraid.) We encountered these
> when patching sys.modules for the purposes of testing, but they could
> affect any code that does magic with sys.modules.
>
> It looks like you can't put arbitrary objects into sys.modules in
> IronPython, but you can with CPython. The following code works fine on
> CPython, but fails on IP :
>
> import sys
> class MockModule(object):
>    def __init__(self, name):
>    self.__name__ = name
>
>
> TopModule = MockModule("TopModule")
> sys.modules["TopModule"] = TopModule
>
> SubModule = MockModule("SubModule")
> SubModule.Object = object()
> TopModule.SubModule = SubModule
> sys.modules["TopModule.SubModule"] = SubModule
>
> import TopModule.SubModule
> from TopModule.SubModule import Object
>
>
> There is also another difference. The following code works fine on
> IronPython, but *not* on CPython
>
>
> import sys
> ModuleType = type(sys)
>
> TopModule = ModuleType("TopModule")
> sys.modules["TopModule"] = TopModule
>
> SubModule = ModuleType("SubModule")
> SubModule.Object = object()
> TopModule.SubModule = SubModule
> # Required for CPython, not IronPython
> # sys.modules["TopModule.SubModule"] = SubModule
>
> import TopModule.SubModule
> from TopModule.SubModule import Object
>
>
> You have to uncomment out 'the line' to get it to work in CPython. (Not
> worth fixing by the way - unless it means that something else is broken
> as a result - just a 'difference'.)
>
> Michael Foord
> http://www.resolversystems.com
>
> --
> Michael Foord
> Resolver Systems
> michael.foord at resolversystems.com
>
> Office address:     17a Clerkenwell Road, London EC1M 5RD, UK
> Registered address: 843 Finchley Road, London NW11 8NA, UK
>
> Resolver Systems Limited is registered in England and Wales as company number 5467329.
> VAT No. GB 893 5643 79
>
> _______________________________________________
> users mailing list
> users at lists.ironpython.com
> http://lists.ironpython.com/listinfo.cgi/users-ironpython.com
> _______________________________________________
> users mailing list
> users at lists.ironpython.com
> http://lists.ironpython.com/listinfo.cgi/users-ironpython.com
>
>