They are very different data structures. Elements in a tuple have the following properties −
Order is maintained.
They are immutable
They can hold any type, and types can be mixed.
Elements are accessed via numeric (zero based) indices.
A Python dictionary is an implementation of a hash table. Elements of a dictionary have the following properties −
Ordering is not guaranteed
Every entry has a key and a value
Elements are accessed using key's values
Entries in a dictionary can be changed.
Key values can be of any hashable type (i.e. not a dict) and types can be mixed while values can be of any type (including other dict’s), and types can be mixed
Both of these data structures can be created using comprehensions. Examples −
Tuple: (1, 'a', (3, 6, 8), 'string')
Dictionary: {'foo': [1, 2, 3], 'bar': 'baz'}