[Python-ideas] write to cell

[Aaron Brady]

Decorator 'FreeVarArr', free variable array, returns an array of its
decoratee (decorated function), with free variables set by name to a range
of values.

Produced & attached.

import new
def cell_values( *cells ):
    return [ cell.cell_contents for cell in cells ]

def CellMake( *opts ):
    dumbopts= [ 'opt%i'% i for i in range( len( opts ) ) ]
    dumbvars= ', '.join( dumbopts )
    innermakefmt= "def innermake( %s ):\n\tdef toget(): %s\n\treturn toget"
    exec innermakefmt% ( dumbvars, dumbvars )
    innerfunc= innermake( *opts )
    freevars= list( innerfunc.func_code.co_freevars )
    freevarindices= map( freevars.index, dumbopts )
    return tuple( [ innerfunc.func_closure[i] for i in freevarindices ] )

def FreeVarArr( **kwargs ):
    vars= kwargs.keys()
    iters= [ kwargs[var] for var in vars]
    def newf( wfunc, closure ):
        return new.function( wfunc.func_code, wfunc.func_globals,
wfunc.func_name, wfunc.func_defaults, closure )
    def recall( wfunc ):
        freevars= list( wfunc.func_code.co_freevars )
        freeindices= [ freevars.index( var ) for var in vars ]
        iterzip= zip( *[ iters[i] for i in freeindices ] )
        closures= [ CellMake( *opts ) for opts in iterzip ]
        funcs= [ newf( wfunc, closure) for closure in closures ]
        return funcs
    return recall

if __name__== '__main__':
    print CellMake( 2, 3, 'abc' )
    a= CellMake( 2, 3, 'abc' )

    def who():
        some, someelse, moreelse, moreover= None, None, None, None
        @FreeVarArr( some= range(8,14), someelse= range(2,19), moreelse=
['a']*90, moreover= ['What!']*90 )
        def what():
            "doc string"
            print someelse, moreelse, moreover
            assert moreelse== 'a'
            assert moreover== 'What!'
            print "this prints", some #assign 'some' to range(8,14) in
successive array functions
            print "John says:", some+ someelse, moreover+ ' '+ moreelse
            return some
        return what
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