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Python: Find the elements in a given set that are not in another set

Python sets: Exercise-19 with Solution

Write a Python program to find the elements in a given set that are not in another set.

Sample Solution:

Python Code:

sn1 = {1,2,3,4,5}
sn2 = {4,5,6,7,8}
print("Original sets:")
print(sn1)
print(sn2)
print("Difference of sn1 and sn2 using difference():")
print(sn1.difference(sn2))
print("Difference of sn2 and sn1 using difference():")
print(sn2.difference(sn1))
print("Difference of sn1 and sn2 using - operator:")
print(sn1-sn2)
print("Difference of sn2 and sn1 using - operator:")
print(sn2-sn1)

Sample Output:

Original sets:
{1, 2, 3, 4, 5}
{4, 5, 6, 7, 8}
Difference of sn1 and sn2 using difference():
{1, 2, 3}
Difference of sn2 and sn1 using difference():
{8, 6, 7}
Difference of sn1 and sn2 using - operator:
{1, 2, 3}
Difference of sn2 and sn1 using - operator:
{8, 6, 7}

Pictorial Presentation:

Python Sets: Find the elements in a given set that are not in another set.

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Previous: Write a Python program to check if a given set is superset of itself and superset of another given set.
Next: Write a Python program to remove the intersection of a 2nd set from the 1st set.

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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