Hi @Ajay-Pandey   Thank you for this.  Here is some code snippets of what I am working on.

table_list = [ { 'table' : ' table1'}, {'table' : 'table2'}, {'table' : 'table3'}]

import concurrent.futures

def run_notebook(table):
    dbutils.notebook.run("./Notebook", 0, table)

max_workers = 5

with concurrent.futures.ThreadPoolExecutor(max_workers=max_workers) as executor:
    executor.map(run_notebook, table_list)

 In my notebook that is being called I have a widget to accept the table value.  How can I do this if I want to pass in a tuple to my notebook?  So something like this?

table_list = [ { 'table' : ' table1', 'attribute1' : 'value1', 'attribute2' : 'value2'}, {'table' : 'table2', 'attribute1' : 'value8', 'attribute2' : 'value19'}, {'table' : 'table3', 'attribute1' : 'value17', 'attribute2' : 'value475'}]

  How can I have the widget accept a tuple or how can I convert the string value of the widget to a tuple?