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What is the difference between list, dictionary and tuple in Python exactly?
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List and tuple is an ordered collection of items. Dictionary is unordered collection. List and dictionary objects are mutable i.e. it is possible to add new item or delete and item from it. Tuple is an immutable object.
Tuples allow duplicate members and are indexed. Lists Lists hold a collection of objects that are ordered and mutable (changeable), they are indexed and allow duplicate members. Sets Sets are a collection that is unordered and unindexed. They are mutable (changeable) but do not allow duplicate values to be held.
Tuple is a collection which is ordered and unchangeable. Allows duplicate members.
The straight answer is NO. You can not have duplicate keys in a dictionary in Python.
A list can store a sequence of objects in a certain order such that you can index into the list, or iterate over the list. List is a mutable type meaning that lists can be modified after they have been created.
A tuple is similar to a list except it is immutable. There is also a semantic difference between a list and a tuple. To quote Nikow's answer:
Tuples have structure, lists have order.
A dictionary is a key-value store. It is not ordered and it requires that the keys are hashable. It is fast for lookups by key.
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