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Python – Test for all Even elements in the List for the given Range

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Given a List of elements, test if all elements are even in a range.

Input : test_list = [3, 1, 4, 6, 8, 10, 1, 9], i, j = 2, 5 
Output : True 
Explanation : 4, 6, 8, 10, all are even elements in range.

Input : test_list = [3, 1, 4, 6, 87, 10, 1, 9], i, j = 2, 5 
Output : False 
Explanation : All not even in Range. 

Method #1: Using loop

In this, we iterate for part of list in the specified range, and flag off the list even if we find anyone odd occurrence in list.

Python3




# Python3 code to demonstrate working of
# Test for all Even elements in List Range
# Using loop
 
# initializing list
test_list = [3, 1, 4, 6, 8, 10, 1, 9]
 
# printing original list
print("The original list is : " + str(test_list))
 
# initializing range
i, j = 2, 5
 
res = True
for idx in range(i, j + 1):
     
    # check if any odd
    if test_list[idx] % 2 :
        res = False
        break
 
# printing result
print("Are all elements even in range : " + str(res))


Output

The original list is : [3, 1, 4, 6, 8, 10, 1, 9]
Are all elements even in range : True

Time Complexity: O(n)
Auxiliary Space: O(1)

Method #2: Using all() + list comprehension

In this, all elements to be even are checked using all(), and list comprehension is used to loop over the elements in the range.

Python3




# Python3 code to demonstrate working of
# Test for all Even elements in List Range
# Using all() + list comprehension
 
# initializing list
test_list = [3, 1, 4, 6, 8, 10, 1, 9]
 
# printing original list
print("The original list is : " + str(test_list))
 
# initializing range
i, j = 2, 5
 
# all() checks for all even elements
res = all(test_list[idx] % 2 == 0 for idx in range(i, j + 1))
 
# printing result
print("Are all elements even in range : " + str(res))


Output

The original list is : [3, 1, 4, 6, 8, 10, 1, 9]
Are all elements even in range : True

Time Complexity: O(n) where n is the number of elements in the list “test_list”.  all() + list comprehension n number of operations.
Auxiliary Space: O(1), no extra space is required



Last Updated : 08 Mar, 2023
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