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This article will explain in detail for you about python there are several derivations, Xiaobian feel quite practical, so share to everyone for a reference, I hope you can gain something after reading this article.

1. List derivations, which contain an expression in square brackets.

old_list = [0,1,2,3,4,5]new_list = []for item in old_list: if item % 2 == 0: new_list.append(item) print(new_list)

2, dictionary derivation,[] changed to {}, and the constituent elements have key and value.

old_student_score_info = { "Jack": { "chinese": 87, "math": 92, "english": 78 }, "Tom": { "chinese": 92, "math": 100, "english": 89 }}new_student_score_info = {}for name, scores in old_student_score_info.items(): if scores["math"] == 100: new_student_score_info.setdefault(name, scores)print(new_student_score_info)

3, set derivation with the use of braces {}, the composition of the element is only one.

old_list = [0, 0, 1, 2, 3] new_set = {item for item in old_list}print(new_set) About "Python has several derivations" This article is shared here, I hope the above content can be of some help to everyone, so that you can learn more knowledge, if you think the article is good, please share it to let more people see.

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