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Python – Remove Tuples from the List having every element as None

  • Last Updated : 11 Oct, 2020

Given a Tuple list, remove all tuples with all None values.

Input : test_list = [(None, 2), (None, None), (3, 4), (12, 3), (None, )] 
Output : [(None, 2), (3, 4), (12, 3)] 
Explanation : All None tuples are removed.

Input : test_list = [(None, None), (None, None), (3, 4), (12, 3), (None, )] 
Output : [(3, 4), (12, 3)] 
Explanation : All None tuples are removed. 
 

Method #1 : Using all() + list comprehension

In this, we use all() to check for all None values for discarding and list comprehension does task of iteration.



Python3




# Python3 code to demonstrate working of 
# Remove None Tuples from List
# Using all() + list comprehension
  
# initializing list
test_list = [(None, 2), (None, None), (3, 4), (12, 3), (None, )]
  
# printing original list
print("The original list is : " + str(test_list))
  
# negating result for discarding all None Tuples
res = [sub for sub in test_list if not all(ele == None for ele in sub)]
  
# printing result 
print("Removed None Tuples : " + str(res))

Output:

The original list is : [(None, 2), (None, None), (3, 4), (12, 3), (None,)]
Removed None Tuples : [(None, 2), (3, 4), (12, 3)]

Method #2 : Using filter() + lambda + all()

In this method, task of filtering None tuples is done using filter() and lambda function to provide None checking functionality using all().

Python3




# Python3 code to demonstrate working of 
# Remove None Tuples from List
# Using filter() + lambda + all()
  
# initializing list
test_list = [(None, 2), (None, None), (3, 4), (12, 3), (None, )]
  
# printing original list
print("The original list is : " + str(test_list))
  
# filter() + lambda to drive logic of discarding tuples
res = list(filter(lambda sub : not all(ele == None for ele in sub), test_list))
  
# printing result 
print("Removed None Tuples : " + str(res))

Output:

The original list is : [(None, 2), (None, None), (3, 4), (12, 3), (None,)]
Removed None Tuples : [(None, 2), (3, 4), (12, 3)]

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