quot>py-callback ( quot: ( args kw -- ret ) -- alien )
Python binding

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Vocabulary
python

Inputs

quot	a quotation with stack effect ( args kw -- ret )

Outputs

alien

an alien

Word description
Creates a python-compatible alien callback from a quotation.

Examples
This is how you create a callback which returns the double of its first positional parameter:

USING: python ;
: double-fun ( -- alien ) [ drop first 2 * ] quot>py-callback ;

Definition

USING: kernel python.ffi ;

IN: python

: quot>py-callback ( quot: ( args kw -- ret ) -- alien )
    [ [ nipd [ [ py> ] [ { } ] if* ] bi@ ] ] dip [ >py ] compose
    compose PyCallback ; inline