How to extract percentages from counter function-CodePudding

I got this function and from the counter, I wanted to extract the numbers of each element in the list and to convert it into percentages so I can know the percentage of each element in the list.

from collections import Counter
import random

dice_rolls = []
for i in range(0, dice_amount):
    dice_rolls.append(random.randint(1,dice_face))
num = Counter(dice_rolls)

CodePudding user response：

Sure - get the total count with sum over the counter's values (though you could just use len(dice_rolls) or dice_amount for that, of course), and then print things out.

The Counter is a dict at heart, so you could just use .items(), but you can also use .most_common(), which yields pairs in decreasing count order.

import collections
import random

dice_rolls = []
dice_amount = 42
dice_face = 6
for i in range(dice_amount):
    dice_rolls.append(random.randint(1, dice_face))
num = collections.Counter(dice_rolls)

total = sum(num.values())
for face, count in num.most_common():
    print(f"{face}: {count} ({count/total:.2%})")

prints out eg

6: 8 (19.05%)
3: 8 (19.05%)
2: 7 (16.67%)
1: 7 (16.67%)
4: 6 (14.29%)
5: 6 (14.29%)