How to use frequency function

The frequency function is a common statistical function used to calculate the frequency of occurrence of each element in a given list. Its usage is usually as follows:

from collections import Counterdef frequency(lst):
    counter = Counter(lst)    return counter

In the above code, we first imported the Counter class, which is Python's built-in tool for counting. Then a function called frequency is defined, which accepts a list as a parameter. Inside the function, we use the Counter class to count the elements in the list and return the result.

For example, if we call the frequency function and pass in a list [1, 2, 3, 1, 2, 1] as a parameter, the function will return a dictionary containing the frequency of each element:

{1: 3, 2: 2, 3: 1}

Among them, the number 1 appears 3 times, the number 2 appears 2 times, and the number 3 appears 1 time.

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