When it is required to extract paired rows, a list comprehension and the ‘all’ operator is used.
Example
Below is a demonstration of the same
my_list = [[10, 21, 34, 21, 37], [41, 41, 52, 68, 68, 41], [12, 29], [30, 30, 51, 51]]
print("The list is :")
print(my_list)
my_result = [row for row in my_list if all(row.count(element) % 2 == 0 for element in row)]
print("The result is :")
print(my_result)Output
The list is : [[10, 21, 34, 21, 37], [41, 41, 52, 68, 68, 41], [12, 29], [30, 30, 51, 51]] The result is : [[30, 30, 51, 51]]
Explanation
A list of list is defined and is displayed on the console.
The list comprehension is used to iterate over the elements.
The ‘all’ operator is used to get the ‘count’ of element, and check if it is divisible by 2.
If yes, it is converted to a list, and is assigned to a variable.
This is displayed as output on the console.