Python Warning - Expected type 'Union[Integral, slice]', got 'str' instead

My code below in python is giving me a warning on the line:

 some_new_object['someVar'] = cd['someVar']

The warning is

Expected type 'Union[Integral, slice]', got 'str' instead

Code:

def some_object():     return {'someId': 0,'someVar' : ''     }def warn_test(in_list):     try:         new_list = []         some_new_object = some_object()         for cd in in_list:             if cd['someVar']:                 new_list.append(cd)         for cd in new_list:             some_new_object['someVar'] = cd['someVar']             in_list.append(some_new_object.copy())         return in_list     except Exception:         print 'baaa' #Main Program new_obj =  some_object() new_obj['someId'] = 1 new_obj['someVar'] = 'Next' new_obj2 =  some_object() new_obj2['someId'] = 1 new_obj2['someVar'] = None new_list = [] new_list.append(new_obj) new_list.append(new_obj2) out_list = warn_test(new_list) for obj in out_list:     print obj

If I change the function warn_test to this:

def warn_test(in_list):    try:        new_list = []        some_new_object = some_object()        for cd in in_list:            if cd['someVar']:                some_new_object['someVar'] = cd['someVar']                new_list.append(some_new_object.copy())        for cd in new_list:            in_list.append(cd)        return in_list    except Exception:        print 'baaa'

It gives me no warning.

Can someone help me to understand why I get the warning, and how I can access the cd['someVar'] in the second iteration without getting a warning?

I know this code is weird, I need this for a project I am working on, I made this test to share here, but it gives me the same Warning so a solution for this will fix it in my system. (No warnings is one of the Must Haves for this system)