a={'Mike':90,'Mark':91,'Amy':89} sorted_scores = sorted(a.items(), key=lambda x: (x[0], -x[1])) print(sorted_scores)解释
时间: 2024-02-04 18:03:56 浏览: 28
这段代码主要是对字典a中的元素进行排序,并将排序结果存储在sorted_scores中。
首先,a是一个字典,其中包含了三个元素,每个元素的键为一个名字,值为一个成绩。
sorted_scores = sorted(a.items(), key=lambda x: (x[0], -x[1]))
sorted函数用于对序列进行排序,其中a.items()将字典a转换为可排序的元组序列,key参数指定了排序的规则,lambda函数中的x代表每个元组,x[0]表示按照名字进行排序,x[1]表示按照成绩进行排序,-x[1]表示按照成绩的倒序进行排序。
最后,sorted_scores存储了排序结果,是一个按照名字升序、成绩降序的元组列表。
相关问题
a={'Mike':90,'Mark':91,'Amy':89} sorted_scores = sorted(a.items(), key=lambda x: (x[0], -x[1])) print(sorted_scores)
The output of the code will be:
[('Amy', 89), ('Mark', 91), ('Mike', 90)]
Explanation:
- The dictionary 'a' contains three key-value pairs representing the scores of three students.
- The 'sorted' function is used to sort the dictionary by the keys and the values.
- The 'items' method is used to convert the dictionary into a list of tuples where each tuple contains the key-value pair.
- The 'key' argument of the 'sorted' function is set to a lambda function that takes a tuple as input and returns a tuple of two values. The first value is the key itself (i.e., the name of the student), and the second value is the negative of the score. The negative is used to sort the scores in descending order.
- The resulting list of tuples is stored in the 'sorted_scores' variable and printed to the console.
a={'Mike':90,'Mark':91,'Amy':89} sorted_scores = sorted(a.items(), key=lambda x: (x[0], -x[1]))
This code sorts the dictionary 'a' by the keys in ascending order and the values in descending order. The result is a list of tuples containing the key-value pairs in the sorted order.
For example, if we print the sorted_scores list, we will get:
[('Amy', 89), ('Mark', 91), ('Mike', 90)]
This means that the key 'Amy' has the lowest score (89), followed by 'Mark' with a score of 91, and 'Mike' with a score of 90. If two keys have the same score, they are sorted alphabetically.
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