What is the dictionary and collection in python

This article mainly introduces what is the dictionary and collection in python, which has certain reference value. Interested friends can refer to it. I hope you will gain a lot after reading this article. Let Xiaobian take you to understand it together.

Dictionary/Set Understanding

Just as we use list inference, we can also use dictionary/set inference. They are easy to use and equally effective. This is an example.

testDict = {i: i * i for i in xrange(10)} testSet = {i * 2 for i in xrange(10)}print(testSet)print(testDict)#set([0, 2, 4, 6, 8, 10, 12, 14, 16, 18])#{0: 0, 1: 1, 2: 4, 3: 9, 4: 16, 5: 25, 6: 36, 7: 49, 8: 64, 9: 81}

Note-the only difference between the two statements is. Also, to run the above code in Python 3, replace with.

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