computer science class xi notes marks ( 'hello'or in double quotation marks ( "hello"the quotes are not part of the stringthey are used to mark the beginning and end of the string for the interpreter for examplestr 'hello friendstr " we cannot perform numerical operations on stringseven when the string contains numeric valueas in str (blist list is sequence of items separated by commas and the items are enclosed in square brackets example #to create list list [ "new delhi"" " #print the elements of the list list print(list [ 'new delhi'' ' (ctuple tuple is sequence of items separated by commas and items are enclosed in parenthesis this is unlike listwhere values are enclosed in brackets once createdwe cannot change the tuple example #create tuple tuple tuple ( "apple" ' '#print the elements of the tuple tuple print(tuple ( "apple" ' 'set set is an unordered collection of items separated by commas and the items are enclosed in curly brackets set is similar to listexcept that it cannot have duplicate entries once createdelements of set cannot be changed example #create set set { , , ,"new delhi"print(type(set )print(set { "new delhi"#duplicate elements are not included in set -