Python: How to quickly count number of occurrences of elements in a list?

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The Python code uses the built-in collections module to create a new object called color_counts. This object is an instance of the Counter class, which is a special kind of dictionary that's used to count the occurrences of items in a collection.

The first line of the code imports the Counter class from the collections module. This means that the code can use the class without having to qualify the name with the module name.

The second line of code creates a list called colors that contains several strings representing different colors. In this case, the list contains three different colors: "red", "green", and "blue". Each color appears more than once in the list.

The third line of code creates a new Counter object and initializes it with the colors list. This tells the Counter object to count the occurrences of each color in the list.

The last line of code prints the color_counts object.

The output will be:
Counter({'green': 3, 'red': 2, 'blue': 1})

A Counter object, for this case the color_counts object, is representing in a way that, it keeps track of count of occurences of each element in the input passed.

So, it can be concluded that this script is counting the number of occurences of each color in the input list and printing that.

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