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Asked: 2026-05-30T18:09:12+00:00

In IronPython 2.7.1 , I can import some .NET assemblies by name: >>> from

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In IronPython 2.7.1, I can import some .NET assemblies by name:

>>> from System.Collections import *
>>> from System.IO import *

Others give me an error:

>>> from System.Xml import *
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named Xml

Doing the following fixes the error:

>>> import clr
>>> clr.AddReferenceByPartialName('System.Xml')
>>> from System.Xml import *

Why do I have to call clr.AddReferenceByPartialName for some assemblies but not others?

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1 Answer

  1. Editorial Team

    Some assemblies, like mscorlib.dll, are there by default. If the documentation for the class you want says it’s in mscorlib (e.g., http://msdn.microsoft.com/en-us/library/system.collections.arraylist.aspx), then you won’t need to add a reference, otherwise you will. It’s similar to when/why you need to add references to your C# project.

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