Count occurrences of all items in list in Python.

In this tutorial, we will learn how to count the occurrences of all items in a list in python, with some cool and easy examples, In many situations, you might have to come up with this type of requirements.

Using collections.counter:

 

To count the occurrences of all items in a list in  python you can use the “collections.counter” class from the built-in collections module. Here’s an example:

from collections import Counter

my_list = ['apple', 'banana', 'cherry', 'banana', 'apple', 'orange', 'apple']

# Create a Counter object
item_counts = Counter(my_list)

# Print the counts
print(item_counts)

output:

Counter({'apple': 3, 'banana': 2, 'cherry': 1, 'orange': 1})

 

 

 

 

Using a loop:

 

You can  also achieve the same result using a loop to iterate through the list and keep track of counts in a dictionary.However, this method is less efficient than using counter.

def count_occurrences(my_list):
  """
  This function counts the occurrences of all items in a list using a loop.

  Args:
      my_list: A list of any data type.

  Returns:
      A dictionary where the keys are the elements from the list and the values are their counts.
  """
  occurrences = {}
  for item in my_list:
    if item in occurrences:
      occurrences[item] += 1
    else:
      occurrences[item] = 1
  return occurrences

# Example usage
my_list = [1, 2, 2, 3, 1, 4, 2]
occurrences = count_occurrences(my_list)
print(occurrences)

output:

{2: 3, 1: 2, 3: 1, 4: 1}