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Python Challenges: Find missing numbers from a list

Python Challenges - 1: Exercise-8 with Solution

Write a Python program to find missing numbers from a list.

Explanation:

Python: Find a missing numbers from a list

Sample Solution:-

Python Code:

def missing_numbers(num_list):
      original_list = [x for x in range(num_list[0], num_list[-1] + 1)]
      num_list = set(num_list)
      return (list(num_list ^ set(original_list)))

print(missing_numbers([1,2,3,4,6,7,10]))
print(missing_numbers([10,11,12,14,17]))

Sample Output: 

[5, 8, 9]                                                                                                     
[13, 15, 16]

Flowchart:

Python Flowchart: Find a missing numbers from a list

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Previous: Write a Python program to find a missing number from a list.
Next: Write a Python program to find three numbers from an array such that the sum of three numbers equal to zero.

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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