the index arguments for exampleconsider list list [ the statement *list would replace by the list with its elements on the index positions soit unpacks the items of the lists examplelist [ list [ res [*list *list print ("concatenated list:\ str(res)outputin the above snippet of codethe statement res [*list *list replaces the list and list with the items in the given order elements of list after elements of list this performs concatenation and results in the below output outputconcatenated list[ itertools chain(methodpython itertools modulesitertools chain(function can also be used to concatenate lists in python the itertools chain(function accepts different iterables such as listsstringtuplesetc as parameters and gives sequence of them as output it results out to be linear sequence the data type of the elements doesn' affect the functioning of the chain(method for examplethe statement itertools chain([ ]['john''bunny']would produce the following output john bunny exampleimport itertools list [