What are Dict and List comprehensions?

Dictionary and list comprehensions are just another concise way to define dictionaries and lists.

Example of list comprehension is-

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x=[i for i in range(5)]
The above code creates a list as below-

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2
4
[0,1,2,3,4]
Example of dictionary comprehension is-

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x=[i : i+2 for i in range(5)]
The above code creates a list as below-

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[0: 2, 1: 3, 2: 4, 3: 5, 4: 6]