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python swigで生成したユーザ定義型のメソッドを上書きする方法

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swigでpython extensionを生成すると、Cで定義した構造体は自動的に以下のような__repr__が定義される。

<swig_mymodule.mytype; proxy of <Swig Object of type 'struct mytype *' at 0x7f6c74210a20> >

このままだとかっこ悪いのでなんとかしたいが、C側で(というかswigで)制御する方法はみつからなかった。

以下のように%pythoncode内でsetattrしてやればswigが生成するpython code内にその内容が出力されるので、import時に上書きされるようになる

swig_mymodule.i
%pythoncode %{
import types

def __mytype_str(self):
    return "<Mytype(…)>”

setattr(mytype, '__str__', types.MethodType(__mytype_str, None, mytype))
%}
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