CODEWITHSUNDEEP
pythonpython-3.xlist
Mahir
Mahir

Reputation: 400

How to find the ranking of a given leaderboard in Python3?

I have a list,

[100,100,50,40,40,20,10]

The list above is the leaderboard scores of different people. I want to convert or find their ranks and store it in a list like this:

[1,1,2,3,3,4,5]

Is there are possible way of doing something like this in Python3?

Upvotes: 3

Views: 578

Answers (3)

Lambda
Lambda

Reputation: 1392

Use pandas.series

import pandas as pd
series = pd.Series(scores)
result = series.rank(method="dense", ascending=0).astype(int).values.tolist()

output:

[1, 1, 2, 3, 3, 4, 5]

Upvotes: 0

asongtoruin
asongtoruin

Reputation: 10369

How about this:

scores = [100,100,50,40,40,20,10]
all_scores = sorted(set(scores), reverse=True)

ranks = [all_scores.index(x) + 1 for x in scores]

print(ranks)

This prints:

[1, 1, 2, 3, 3, 4, 5]

The way this works is we take the unique elements from the list of scores (set(scores)) and sort them in descending order. Then, we find the position of each element in scores within that list, and add 1 to get the 1-based ranks rather than 0-based.

Upvotes: 4

Ali Yılmaz
Ali Yılmaz

Reputation: 1705

If there are two winners (e.g. rank:1), the follower should be ranked 3rd. Regarding this approach, this should do the work:

>>> grades = [100, 100, 50, 40, 40, 20, 10] 
>>> ranks = [grades.index(x)+1 for x in sorted(grades, reverse=True)]
>>> ranks
[1, 1, 3, 4, 4, 6, 7]

Upvotes: 1

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