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Python: Find the majority element from a given array of size n using Collections module

Python Collections: Exercise-17 with Solution

Write a Python program to find the majority element from a given array of size n using Collections module.

Note: The majority element algorithm finds a majority element, if there is one: that is, an element that occurs repeatedly for more than half of the elements of the input.

Sample Solution:

Python Code:

import collections
class Solution(object):
    def majorityElement(self, nums):
        """
        :type nums: List[int]
        :return type: int
        """
        count_ele=collections.Counter(nums)
        return count_ele.most_common()[0][0]

result = Solution().majorityElement([10,10,20,30,40,10,20,10])
print(result)

Sample Output:

10

Flowchart:

Python Collections: Find the majority element from a given array of size n using Collections module.

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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