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Python: Check if a given value is present in a set or not

Python sets: Exercise-16 with Solution

Write a Python program to check if a given value is present in a set or not.

Sample Solution:

Python Code:

nums = {1, 3, 5, 7, 9, 11}
print("Original sets(nums): ",nums,"\n")
print("Test if 6 exists in nums:")
print(6 in nums)
print("Test if 7 exists in nums:")
print(7 in nums)
print("Test if 11 exists in nums:")
print(11 in nums)
print("Test if 0 exists in nums:")
print(0 in nums)
print("\nTest if 6 is not in nums")
print(6 not in nums)
print("Test if 7 is not in nums")
print(7 not in nums)
print("Test if 11 is not in nums")
print(11 not in nums)
print("Test if 0 is not in nums")
print(0 not in nums)

Sample Output:

Original sets(nums):  {1, 3, 5, 7, 9, 11} 

Test if 6 exists in nums:
False
Test if 7 exists in nums:
True
Test if 11 exists in nums:
True
Test if 0 exists in nums:
False

Test if 6 is not in nums
True
Test if 7 is not in nums
False
Test if 11 is not in nums
False
Test if 0 is not in nums
True

Pictorial Presentation:

Python Sets: Check if a given value is present in a set or not.
Python Sets: Check if a given value is present in a set or not.

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Previous: Write a Python program to find the length of a set.
Next: Write a Python program to check if two given sets have no elements in common.

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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