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Python: Remove an item from a set if it is present in the set

Python sets: Exercise-5 with Solution

Write a Python program to remove an item from a set if it is present in the set.

Sample Solution:

Python Code:

#Create a new set
num_set = set([0, 1, 2, 3, 4, 5])
print("Original set elements:")
print(num_set)
print("\nRemove 0 from the said set:")
num_set.discard(4)
print(num_set)
print("\nRemove 5 from the said set:")
num_set.discard(5)
print(num_set)
print("\nRemove 2 from the said set:")
num_set.discard(5)
print(num_set)
print("\nRemove 7 from the said set:")
num_set.discard(15)
print(num_set)

Sample Output:

Original set elements:
{0, 1, 2, 3, 4, 5}

Remove 0 from the said set:
{0, 1, 2, 3, 5}

Remove 5 from the said set:
{0, 1, 2, 3}

Remove 2 from the said set:
{0, 1, 2, 3}

Remove 7 from the said set:
{0, 1, 2, 3}

Pictorial Presentation:

NumPy Sets: Remove an item from a set if it is present in the set.

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Previous: Write a Python program to remove item(s) from a given set.
Next: Write a Python program to create an intersection of sets.

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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