如何从python字典中存储了多个值的键访问值？

Question

My dictionary looks like this:

{James: [10, 7, 9], 'Bob': [3, 8, 4], 'Charles': [6, 2, 5]}

What I want to do is, output each user's score in order of who got the highest score. And with their name. At the moment, I am only able to print the student with the highest score:

inverse = [(value, key) for key, value in score_dict.items()]

print (max(inverse)[1])

The output is:

James

The output that I am trying to get is:

James 10

Bob 8

Charles 6

Answer 1

You don't need your inverse dictionary at all; you're not trying to find the single highest score among all of the students; instead, you want to find the highest score for each student.

To do so, do the following:

scores = {'James': [10, 7, 9], 'Bob': [3, 8, 4], 'Charles': [6, 2, 5]}
for name in scores.keys:
    print(name + " " + str(max(scores[name])))

This avoids the need for a new dictionary. The most complex part of this is str(max(scores[name])) , which, reading from innermost to outermost: "Take name, find name's list of scores, find the max value in their scores, and then turn that into a string".

Answer 2

You can simply create a list of tuples with userwise highscore and later sort it with score. Something like this,

x = {'James': [10, 7, 9], 'Bob': [3, 8, 4], 'Charles': [6, 2, 5]}
y = [(k, max(v)) for k, v in x.items()]
for k, v in sorted(y, key=lambda a: a[1], reverse=True):
    print (k, v)