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IronPython 3
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IronPython 3

Official Website

IronPython is an open-source implementation of the Python programming language which is tightly integrated with the .NET Framework. IronPython can use the .NET Framework and Python libraries, and other .NET languages can use Python code just as easily.

IronPython 3 targets Python 3, including the re-organized standard library, Unicode strings, and all of the other new features.


Builds of IronPython 3 are not yet provided.


On Windows machines, start a Visual Studio command prompt and type:

> make

On Unix machines, make sure Mono is installed and in the PATH, and type:

$ make

Since the main development is on Windows, Mono bugs may inadvertantly be introduced

  • please report them!

Supported Platforms

IronPython 3 currently builds for .NET 3.5 SP1, .NET 4.0, and .NET 4.5. The main platform will be .NET 4.5, but .NET 4.0, 3.5, and Silverlight 5 will still be supported for embedding.

Support for Android, Windows 8 Store Apps (Metro), Window Phone 8, and iOS are also planned (in roughly that order).

Custom DLR

If you need to make changes to the DLR, you can point IronPython at your local DLR using set-dlr-source:

set-dlr-source ..\dlr


./ ../dlr


After making DLR changes, commit them, update the version, and release an updated NuGet. Then, update the DlrVersion property in CurrentVersion.props.

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