As many of you are familiar with list comprehension in Python, let me inform you about set comprehension. You can create a set from a list or a dictionary. Example: #create set from list >>> s = set([1, 2, 3]) >>> s set([1, 2, 3]) #create set from dictionary (keys) >>> dt = {1: 10, 2: 20, 3: 30} >>> dt {1: 10, 2: 20, 3: 30} >>> type(dt) <type 'dict'> >>> s = set(dt) >>> s set([1, 2, 3]) Now we can create a set without using the set() function: (The feature is available in Python 3.x and Python 2.7) >>> s = {1, 2, 3, 'Bangladesh', 'python', 1.15} >>> type(s) <type 'set'> >>> And here is an example of set comprehension (similar to list comprehension): >>> s = { x for x in range(10) } >>> s set([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])