variable casting for inputs

[har]

Hi all,

not sure if this belongs here or on the Vectorscript board...

I'm pretty new to Marionette and Vectorscript and have only limited experience with Python in general - Please be very slow with me

My task:

Inputs are an array of strings and a string. I want to output an array of all indices in the array that match the input string.

My code:

@Marionette.NodeDefinition
class Params(metaclass = Marionette.OrderedClass):
this = Marionette.Node( 'Indices' )
this.SetDescription ('Find all Indices in List that equal Item')
this.SetListAbsorb()
list = Marionette.PortIn( [] )
list.SetDescription( "The input list" )
item = Marionette.PortIn( None )
item.SetDescription( "The item to be searched" )
outlist = Marionette.PortOut()   
outlist.SetDescription( "The result index list" )

def RunNode(self):
item = self.Params.item.value
lst = self.Params.list.value

outlist = [i for i, x in enumerate(lst) if x == item]

self.Params.outlist.value = outlist

My problem:

the item value seems to be casted to a "wrong" type, resulting in no output. converting it with "str()" won't help either.

As soon as I hardcode item to some string, the function will work as expected.

What am I doing wrong here?

Thanks a lot in advance for any answer!

[Patrick Winkler]

Hello har,

You can solve this nealry with pure marionette. Take a look into the attached file. (The Equal 2 node in the Example is not native.)

[har]

Hi Patrick,

thanks a lot, that works for me.

Also, greetings from Austria

I deleted the GetItem node as I couldn't see any purpose and the network still works.

Was there a specific reason for it?

Aside from that, I'd still be interested why my script wouldn't work.

Can anyone give some insight here?

[Patrick Winkler]

You are right, GetItem is needless. I just didn't notice in the hurry...

Finding the bug in your code was a real brainteaser:

SetListAbsorb() will convert item 'A' for example to a list: ['A']

You can solve this by declaring list as PortInLits:

@Marionette.NodeDefinition
class Params(metaclass = Marionette.OrderedClass):
this = Marionette.Node( 'Indices' )
this.SetDescription ('Find all Indices in List that equal Item')
#this.SetListAbsorb()
list = Marionette.PortInLists ( [] )
list.SetDescription( "The input list" )
item = Marionette.PortIn( None )
item.SetDescription( "The item to be searched" )
outlist = Marionette.PortOut()   
outlist.SetDescription( "The result index list" )

def RunNode(self):
item = self.Params.item.value
lst = self.Params.list.value

print (type (item))

outlist = [i for i, x in enumerate(lst) if x == item ]

self.Params.outlist.value = outlist

Edited May 2, 2016 by Patrick Winkler

[har]

Hi Patrick,

thanks for the insight!

That actually helps me a great deal with another project...