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python count unique values in list

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Shy Stag answered on August 23, 2020 Popularity 10/10 Helpfulness 2/10

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python count unique values in list

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len(set(["word1", "word1", "word2", "word3"]))
# set is like a list but it removes duplicates
# len counts the number of things inside the set

Popularity 10/10 Helpfulness 2/10 Language python

Source: Grepper

Tags: list python

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Contributed on Aug 23 2020

Shy Stag

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python count number of unique elements in a list

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# Basic syntax:
len(set(my_list))
# By definition, sets only contain unique elements, so when the list
# is converted to a set all duplicates are removed. 

# Example usage:
my_list = ['so', 'so', 'so', 'many', 'duplicated', 'words']
len(set(my_list))
--> 4

# Note, list(set(my_list)) is a useful way to return a list containing
#	only the unique elements in my_list

Popularity 10/10 Helpfulness 5/10 Language python

Source: stackoverflow.com

Tags: count coun

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Contributed on Oct 04 2020

Charles-Alexandre Roy

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Get unique values from a Python list

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# just turn it into a set and then convert again into a list
res = list(set(lst1)))
 
# now check the lengths of the two lists
print(len(res))
print(len(lst1))

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Tags: get

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Contributed on Aug 16 2022

Sumaia Parveen Shupti

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count unique elements in list python

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from collections import Counter

words = ['a', 'b', 'c', 'a']

Counter(words).keys() # equals to list(set(words))
Counter(words).values() # counts the elements' frequency

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Source: stackoverflow.com

Tags: count-unique count-uniq

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Contributed on Dec 12 2021

Real Raccoon

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how to find unique values in list in python

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mylist = ['nowplaying', 'PBS', 'PBS', 'nowplaying', 'job', 'debate', 'thenandnow']
myset = set(mylist)
print(myset)

Popularity 10/10 Helpfulness 4/10 Language python

Source: stackoverflow.com

Tags: find

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Contributed on Feb 25 2021

Courageous Cod

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counting unique values python

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df.loc[df['mID']=='A','hID'].agg(['nunique','count','size'])

Popularity 10/10 Helpfulness 2/10 Language python

Source: stackoverflow.com

Tags: counting countin

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Contributed on Oct 02 2020

Confused Cat

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count unique values in python

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words = ['a', 'b', 'c', 'a']
unique_words = set(words)             # == set(['a', 'b', 'c'])
unique_word_count = len(unique_words) # == 3

Popularity 10/10 Helpfulness 2/10 Language python

Source: stackoverflow.com

Tags: python py

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Contributed on Sep 28 2020

Filthy Flatworm

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python count unique values in list

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