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Python – Check if Tuple contains only K elements

  • Last Updated : 08 Jun, 2020

Sometimes, while working with Python tuples, we can have a problem in which we need to test if any tuple contains elements from set K elements. This kind of problem is quite common and have application in many domains such as web development and day-day programming. Let’s discuss certain ways in which this task can be done.

Input : test_tuple = (1, 2, 3, 2, 1, 2), K = [1, 2, 3, 4]
Output : True

Input : test_tuple = (1, 2, 3), K = [1, 2]
Output : False

Method #1 : Using all()
This is one of the ways in which this task can be performed. In this, we check for the presence of all the elements in tuple are just from certain set of numbers using inbuilt function all().




# Python3 code to demonstrate working of 
# Check if Tuple contains only K elements
# Using all()
  
# initializing tuple
test_tuple = (3, 5, 6, 5, 3, 6)
  
# printing original tuple
print("The original tuple : " + str(test_tuple))
  
# initializing K elements
K = [3, 6, 5]
  
# Check if Tuple contains only K elements
# Using all()
res = all(ele in K for ele in test_tuple)
  
# printing result 
print("Does tuples contains just from K elements : " + str(res))
Output :



The original tuple : (3, 5, 6, 5, 3, 6)
Does tuples contains just from K elements : True

 

Method #2 : Using set()
This is yet another way to solve this problem. In this, we convert the tuples, to set and then test the less and equal to relation with the query K elements.




# Python3 code to demonstrate working of 
# Check if Tuple contains only K elements
# Using set()
  
# initializing tuple
test_tuple = (3, 5, 6, 5, 3, 6)
  
# printing original tuple
print("The original tuple : " + str(test_tuple))
  
# initializing K elements
K = [3, 6, 5]
  
# Check if Tuple contains only K elements
# Using all()
res = set(test_tuple) <= set(K)
  
# printing result 
print("Does tuples contains just from K elements : " + str(res))
Output :
The original tuple : (3, 5, 6, 5, 3, 6)
Does tuples contains just from K elements : True

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