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Python – Remove Columns of Duplicate Elements
When it is required to remove columns of duplicate elements, a method is defined that creates an empty set. The list is iterated over, and if it is not found, it is added to the set.
Example
Below is a demonstration of the same
from itertools import chain
def remove_dupes(my_sub):
my_string = set()
for i, elem in enumerate(my_sub):
if elem not in my_string:
my_string.add(elem)
else:
yield i
my_list = [[5, 1, 6, 7, 9], [6, 3, 1, 9, 1], [4, 2, 9, 8, 9], [5, 1, 6, 7, 3]]
print("The list is : ")
print(my_list)
K = 3
temp_idxs = set(chain.from_iterable(remove_dupes(sub) for sub in my_list))
my_result = [[elem for i, elem in enumerate( sub) if i not in temp_idxs] for sub in my_list]
print("The result is : ")
print(my_result)Output
The list is : [[5, 1, 6, 7, 9], [6, 3, 1, 9, 1], [4, 2, 9, 8, 9], [5, 1, 6, 7, 3]] The result is : [[5, 1, 6, 7], [6, 3, 1, 9], [4, 2, 9, 8], [5, 1, 6, 7]]
Explanation
The required packages are imported into the environment.
A method named ‘remove_dupes’ is defined that takes a list as a parameter.
An empty set is created.
The elements in the list are enumerated over, and if an element is not found, it is added to the empty set.
Otherwise, the iterator of the enumeration is yielded.
Outside the function, a list of list is defined and is displayed on the console.
A value for ‘K’ is defined.
The method is called by iterating over it.
It is converted to a set and is assigned to a variable.
Again, it is enumerated, and iterated and stored in a result variable.
This result variable is displayed as output on the console.
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