How python finds the most frequently occurring elements in iterable objects

This article mainly introduces python how to find the most frequently occurring elements in iterable objects, which has a certain reference value, and interested friends can refer to it. I hope you can learn a lot after reading this article.

Find the elements that occur most frequently in iterable objects

Finding the most common elements in the list is a very common task. You can use for loops and dictionaries (map), but this is not necessary because there are Counter classes in the collections module:

From collections import Counter cheese = ["gouda", "brie", "feta", "cream cheese", "feta", "cheddar", "parmesan", "parmesan", "cheddar", "mozzarella", "cheddar", "gouda", "parmesan", "camembert", "emmental", "camembert" "parmesan"] cheese_count = Counter (cheese) print (cheese_count.most_common (3)) # Prints: [('parmesan', 4), (' cheddar', 3), ('gouda', 2)]

In fact, Counter is just a dictionary that maps elements to the number of occurrences, so you can use it as a normal dictionary:

Python print (cheese_count ["mozzarella"]) K40K cheese_count ["mozzarella"] + = 1 print (cheese_count ["mozzarella"]) K41K

In addition, you can easily add more elements using the update (more_words) method. Another cool feature of Counter is that you can use mathematical operations (addition and subtraction) to combine and subtract Counter instances.

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