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Python: Find the items that are parity outliers in a given list

Python List: Exercise - 236 with Solution

Write a Python program to find the items that are parity outliers in a given list.

  • Use collections.Counter with a list comprehension to count even and odd values in the list.
  • Use collections.Counter.most_common() to get the most common parity.
  • Use a list comprehension to find all elements that do not match the most common parity.

Sample Solution:

Python Code:

from collections import Counter
def find_parity_outliers(nums):
  return [
    x for x in nums
    if x % 2 != Counter([n % 2 for n in nums]).most_common()[0][0]
  ] 
print(find_parity_outliers([1, 2, 3, 4, 6]))  
print(find_parity_outliers([1, 2, 3, 4, 5, 6, 7]))

Sample Output: 

[1, 3]
[2, 4, 6]

Flowchart:

Flowchart: Find the items that are parity outliers in a given list.

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Previous: Write a Python program to find the index of the last element in the given list that satisfies the provided testing function.
Next: Write a Python program to convert a given list of dictionaries into a list of values corresponding to the specified key.

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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