Modifying signature of ctor in class

Ian Kelly ian.g.kelly at
Fri Sep 25 00:10:17 CEST 2015

On Thu, Sep 24, 2015 at 2:28 PM, Joseph L. Casale
<jcasale at> wrote:
> I have a class factory where I dynamically add a constructor to the class output.
> The method is a closure and works just fine, however to accommodate the varied
> input its signature is (*args, **kwargs).
> While I modify the doc strings, the ctor sig is not optimal. Without building
> this a string and using eval, is there anything that can be done about this?

In Python 3.3+ you can attach a Signature object to a function by
setting the function's __signature__ attribute. In Python 3.4+ the
__signature__ is used in generating the signature for PyDoc and

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