Script Snap Data Structures

[jskrable]

Hello,

I have written a script to create a JSON object with counters of a parameterized length, with the desired structure like this:

[
{
“counter”: 1
},
{
“counter”: 2
},
{
“counter”: 3
},
…
]

However, when I do this through a loop in a script snap, it puts the result in an extraneous array, like this:

[
[
{
“counter”: 1
},
{
“counter”: 2
},
{
“counter”: 3
},
…
]
]

Can anyone let me know why this is happening? I can’t get rid of the extra array using a structure or mapper snap either. My script looks like this:

def execute(self):
    self.log.info("Executing Transform script")
    list = []
    for i in range(1,277):
        entry = {}
        entry["counter"] = i
        list.append(entry)
        
    output = list
    
    try:
        # Read the next document, wrap it in a map and write out the wrapper
        self.output.write(list)
    except Exception as e:
        errWrapper = {
            'errMsg' : str(e.args)
        }
        self.log.error("Error in python script")
        self.error.write(errWrapper)

    self.log.info("Finished executing the Transform script")

Has anyone run into something like this before?

Thanks,
Jack

[aleung]

If that is really all you trying to do. You could achieve what you wanted with just the “Sequence” snap and it would create the structure you desire.

[jskrable]

I wasn’t aware of that snap, thanks for bringing it to my attention.