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Python count occurrences of all items in list

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If you only want a single item’s count in the list, use the count method. Use the Python Counter method to count occurrences of all items in the list.

Use Counter if you are using Python 2.7 or 3.x and you want the number of occurrences for each element:

Python count occurrences of all items in the list

Simple example code.

from collections import Counter

l1 = [1, 2, 3, 4, 1, 4, 1]
res = l1.count(1)

z = ['blue', 'red', 'blue', 'yellow', 'blue', 'red']
all = Counter(z)


Python count occurrences of all items in the list

Counting all items with count()

To count the occurrences of items in l one can simply use a list comprehension and the count() method

[[x,l.count(x)] for x in set(l)]

(or similarly with a dictionary dict((x,l.count(x)) for x in set(l)))


>>> l = ["a","b","b"]
>>> [[x,l.count(x)] for x in set(l)]
[['a', 1], ['b', 2]]
>>> dict((x,l.count(x)) for x in set(l))
{'a': 1, 'b': 2}

Counting all items with Counter()

Alternatively, there’s the faster Counter class from the collections library



>>> l = ["a","b","b"]
>>> from collections import Counter
>>> Counter(l)
Counter({'b': 2, 'a': 1})

Do comment if you have any doubts or suggestions on this Python list topic.

Note: IDE: PyCharm 2021.3.3 (Community Edition)

Windows 10

Python 3.10.1

All Python Examples are in Python 3, so Maybe its different from python 2 or upgraded versions.

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