How to access project/global variables from Scenario Reporter custom script

In scenarios there is a possibility to create custom variables via python code in the "Reporters" section.

How can I access global variable in the python?

Import of dataiku is not possible

<type 'exceptions.ImportError'> : No module named dataiku

import json

import dataiku

# compute your additional variables from the list of report items

# and return them as a dictionary.

def get_variables(items_json, scenario_run_json, step_run_output_json):

items = json.loads(items_json)

client = dataiku.api_client()

client.get_variables()....