Question

How to count unique values in a list with Python

Answer 1

from collections import Counter

lst = ['python', 'c', 'c++', 'c', 'c++', "c++", "swift"]


print(Counter(lst).keys())

print(Counter(lst).values())

print(Counter(lst))





'''
run:

dict_keys(['python', 'c', 'c++', 'swift'])
dict_values([1, 2, 3, 1])
Counter({'c++': 3, 'c': 2, 'python': 1, 'swift': 1})

'''

 

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Answer 2

from collections import Counter

lst = ['python', 'c', 'c++', 'c', 'c++', "c++", "swift"]


dict = Counter(lst)


for key, value in dict.items():
    print(key, ":", value)
  





'''
run:

python : 1
c : 2
c++ : 3
swift : 1

'''

 

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Answer 3

lst = ['python', 'c', 'c++', 'c', 'c++', "c++", "swift"]

print(len(set(lst)))
  





'''
run:

4

'''

 

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Answer 4

import numpy as np

lst = ['python', 'c', 'c++', 'c', 'c++', "c++", "swift"]

np.unique(lst)

print(len(np.unique(lst)))
  




'''
run:

4

'''

 

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