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Python Challenges: Find the single number which occurs odd numbers and other numbers occur even number

Python Challenges - 1: Exercise-32 with Solution

Write a Python program to find the single number which occurs odd numbers and other numbers occur even number.

Explanation:

Python: Find the single number which occurs odd numbers and other numbers occur even number

Sample Solution:-

Python Code:

def odd_occurrence(arr):
 
    # Initialize result
    result = 0
     
    # Traverse the array
    for element in arr:
        # XOR
        result = result ^ element
 
    return result
 
# Test data
num1 = [ 4, 5, 4, 5, 2, 2, 3, 3, 2, 4, 4 ]
 
print(odd_occurrence(num1))

Sample Output:

2

Flowchart:

Python Flowchart: Find the single number which occurs odd numbers and other numbers occur even number

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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