Python - Filter Tuples with All Even Elements

Python – Filter Tuples with All Even Elements

Last Updated : 02 Sep, 2020

Given List of tuples, filter only those with all even elements.

Input : test_list = [(6, 4, 2, 8), (5, 6, 7, 6), (8, 1, 2), (7, )]
Output : [(6, 4, 2, 8)]
Explanation : Only 1 tuple with all even elements.
Input : test_list = [(6, 4, 2, 9), (5, 6, 7, 6), (8, 1, 2), (7, )]
Output : []
Explanation : No tuple with all even elements.

Method #1 : Using loop

In this, we iterate each tuple, and check for all even elements using % operator and if even one element is odd, tuple is flagged and not added in result list.

Python3

# Python3 code to demonstrate working of 
# Filter Tuples with All Even Elements
# Using loop
  
# initializing list
test_list = [(6, 4, 2, 8), (5, 6, 7, 6), (8, 0, 2), (7, )]
  
# printing original list
print("The original list is : " + str(test_list))
  
res_list = []
for sub in test_list:
    res = True 
      
    # check if all are even
    for ele in sub:
        if ele % 2 != 0:
            res = False
            break
    if res:
        res_list.append(sub)
  
# printing results
print("Filtered Tuples : " + str(res_list))

Output

The original list is : [(6, 4, 2, 8), (5, 6, 7, 6), (8, 0, 2), (7, )]
Filtered Tuples : [(6, 4, 2, 8), (8, 0, 2)]

Method #2 : Using all() + list comprehension

In this, the task of checking for all elements to be even is done using all(), and list comprehension is used for task of filtering post checking.

Python3

# Python3 code to demonstrate working of 
# Filter Tuples with All Even Elements
# Using all() + list comprehension
  
# initializing list
test_list = [(6, 4, 2, 8), (5, 6, 7, 6), (8, 0, 2), (7, )]
  
# printing original list
print("The original list is : " + str(test_list))
  
# testing for tuple to be even using all()
res = [sub for sub in test_list if all(ele % 2 == 0 for ele in sub)]
  
# printing results
print("Filtered Tuples : " + str(res))

Output

The original list is : [(6, 4, 2, 8), (5, 6, 7, 6), (8, 0, 2), (7, )]
Filtered Tuples : [(6, 4, 2, 8), (8, 0, 2)]

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