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Remove duplicate lists in tuples (Preserving Order) in Python
When it is required to remove the duplicates present in tuple of list, as well as preserving the order, a list comprehension and the 'set' method can be used.
The list comprehension is a shorthand to iterate through the list and perform operations on it.
Python comes with a datatype known as 'set'. This 'set' contains elements that are unique only. The set is useful in performing operations such as intersection, difference, union and symmetric difference.
Below is a demonstration of the same −
Example
my_tuple_1 = ([1, 21, 34] , [11, 0, 98], [45, 67, 56])
print("The tuple of list is : ")
print(my_tuple_1)
temp_val = set()
my_result = [elem for elem in my_tuple_1 if not(tuple(elem) in temp_val or temp_val.add(tuple(elem)))]
print("The unique tuple of list is : ")
print(my_result)Output
The tuple of list is : ([1, 21, 34], [11, 0, 98], [45, 67, 56]) The unique tuple of list is : [[1, 21, 34], [11, 0, 98], [45, 67, 56]]
Explanation
- A tuple of list is defined, and is displayed on the console.
- An empty set is created.
- The tuple of list is iterated over, and if it is not present in the previously defined list, it is added to the list.
- This would result in a set that contains unique values.
- This is assigned to a value.
- It is displayed on the console.
Updated on: 12-Mar-2021
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