Python - Counting frequency of strings in a list

Question

I would like to know how to count the frequency of strings in a list and use them.

example list: fruits = (['apple', 'banana', 'banana', 'apple', 'mango'])
def fruitcounter():
    from collections import Counter
    a = Counter(fruits)
    return(a)
Counter({'apple': 2, 'banana': 2, 'mango': 1})

The fruits list is random. Is there any way to use these numbers and assign them so I can do other calculations like the percentage of apples in the list?

Answer 1

Use a dictionary comprehension that divides all the counts by the length of the list.

a = Counter(fruits)
percents = {fruit: count/len(fruits)*100 for fruit, count in a.items()}

Result:

{'apple': 40, 'banana': 40, 'mango': 20}

Answer 2

You can ether user len(fruits) or sum up the counter values to get the amount of total fruits:

from collections import Counter

fruits = (['apple', 'banana', 'banana', 'apple'])
counts = Counter(fruits)
totals = sum(counts.values())

bananaPercent = 100/totals*counts['banana']
print('You got %s percent bananas!' % bananaPercent)

Output:

You got 50 percent bananas!

Edit, in case you dont know the fruits:

from collections import Counter

fruits = (['apple', 'banana', 'banana', 'apple'])
counts = Counter(fruits)
totals = sum(counts.values())

for k in counts.keys():
    kPercent = 100/totals*counts[k]
    print('%ss make %s percent!' % (k, kPercent))

Output:

apples make 50 percent!
bananas make 50 percent!

Answer 3

to calculate the percentage of apples in the list you could access the frequency of the apples and divide by the total amount of fruits like this:

from collections import Counter
fruits = ['apple', 'banana', 'banana', 'apple', 'mango']

c = Counter({'apple': 2, 'banana': 2, 'mango': 1})
apple_percentage = 100 * c['apple']/len(fruits)
print(f'{apple_percentage}%')

output:

40.0%

Answer 4

Try to do this without using counter library

fruit=['apple', 'banana', 'banana', 'apple', 'mango']
unique_words = set(fruit) 
c=[]  
countvalue={}
allpercent={}
for key in unique_words: 
        c= fruit.count(key)     #count no of fruits
        countvalue[key]=c   
        percent=c/len(fruit)*100  #calculate percent
        allpercent[key] = percent
        print('percent of ',key,' is ' , percent)
print('\ncounts no of fruits in dictionary \n')  
print(countvalue)

print('\npercentage value in dictionary \n')
print(allpercent)
#output
##percent of  mango  is  20.0
#percent of  banana  is  40.0
#percent of  apple  is  40.0

#counts no of fruits in dictionary 

#{'mango': 1, 'banana': 2, 'apple': 2}

#percentage value in dictionary 

#{'mango': 20.0, 'banana': 40.0, 'apple': 40.0}