tuples and dictionaries unit structure objectives tuples accessing values in tuples tuple assignment tuples as return values variable-length argument tuples basic tuples operations concatenation repetition in operator iteration built-in tuple functions creating dictionary accessing values in dictionary updating dictionary deleting elements from dictionary properties of dictionary keys operations in dictionary built-in dictionary functions built-in dictionary methods summary exercise references objectives to understand when to use dictionary to study how dictionary allows us to characterize attributes with keys and values to learn how to read value from dictionary to study how in python to assign key-value pair to dictionary to understand how tuples returns values