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Python: Count the occurrence of each element of a given list

Python Collections: Exercise-30 with Solution

Write a Python program to count the occurrence of each element of a given list.

Sample Solution:

Python Code:

from collections import Counter
colors = ['Green', 'Red', 'Blue', 'Red', 'Orange', 'Black', 'Black', 'White', 'Orange']
print("Original List:")
print(colors)
print("Count the occurrence of each element of the said list:")
result = Counter(colors)
print(result)
nums = [3,5,0,3,9,5,8,0,3,8,5,8,3,5,8,1,0,2]
print("\nOriginal List:")
print(nums)
print("Count the occurrence of each element of the said list:")
result = Counter(nums)
print(result)

Sample Output:

Original List:
['Green', 'Red', 'Blue', 'Red', 'Orange', 'Black', 'Black', 'White', 'Orange'] Count the occurrence of each element of the said list: Counter({'Red': 2, 'Orange': 2, 'Black': 2, 'Green': 1, 'Blue': 1, 'White': 1}) Original List:
[3, 5, 0, 3, 9, 5, 8, 0, 3, 8, 5, 8, 3, 5, 8, 1, 0, 2] Count the occurrence of each element of the said list: Counter({3: 4, 5: 4, 8: 4, 0: 3, 9: 1, 1: 1, 2: 1})

Flowchart:

Python Collections: Count the occurrence of each element of a given list.

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Previous: Write a Python program to get the frequency of the elements in a given list of lists. Use collections module.
Next: Write a Python program to count the most common words in a dictionary.

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Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

  • The os and os.path modules.
  • The __file__ constant
  • os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
  • os.path.dirname(path) (returns "the directory name of pathname path")
  • os.getcwd() (returns "a string representing the current working directory")
  • os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m