Convert Python Dictionary Object to JSON String

from io.hevo.api import Event
from io.hevo.api import Utils

def transform(event):
    eventName = event.getEventName()
    properties = event.getProperties()

    <dictionary> = {<"key-value1": "key-value2", "key-value3": "key-value4">} # JsonObject from a source table
    properties['jsonStr'] = Utils.dictToJsonString(<dictionary>)
    return event

from io.hevo.api import Event
from io.hevo.api import Utils

def transform(event):
    eventName = event.getEventName()
    properties = event.getProperties()

    customer_keys = ['name', 'location', 'exp']

    customer = {}
    for key in customer_keys:
        customer[key] = properties[key]
        del properties[key]

    customer_str = Utils.dictToJsonString(customer)
    properties['customer'] = customer_str

    return event