When it is required to test if all elements are unique in columns of a matrix, a simple iteration and a list comprehension along with the ‘set’ operator are used.
Below is a demonstration of the same −
my_list = [[11, 24, 84], [24, 55, 11], [7, 11, 9]] print("The list is :") print(my_list) my_result = True for index in range(len(my_list)): column = [ele[index] for ele in my_list] if len(list(set(column ))) != len(column ): my_result = False break if(my_result == True): print("All columns are unique") else: print(("All columns are not unique"))
The list is : [[11, 24, 84], [24, 55, 11], [7, 11, 9]] All columns are unique
A list of list with integers is defined and is displayed on the console.
A variable is assigned Boolean value ‘True’.
The list is iterated over, and list comprehension is used to find index of element.
If a specific condition is fulfilled, i.e if the length of unique elements in the list is not equal to the length of the elements, the Boolean value is initialized to ‘False’.
The control breaks out of the loop.
In the end, depending on the Boolean value, the relevant message is displayed on the console.