Python – Filter Elements of a Set
To filter elements of a Set in Python, call filter() builtin function and pass the filtering function and set as arguments. The filtering function should take an argument and return True if the item has to be in the result, or False if the item has to be not in the result.
filter() function returns a filter object, which we can convert it to a set using set() builtin function.
Python filter() builtin function
Examples
1. Filter Positive Numbers from a Set
In the following program, we take a set s with some numbers, and filter only positive numbers using filter function.
Python Program
s = {2, -5, -8, 1, -14, 3, 16}
result = filter(lambda x: x >= 0, s)
result = set(result)
print(result) Try Online Output
{16, 1, 2, 3} 2. Filter strings of length 5 in a set
Now, let us take a set of strings are filter those strings whose length is 5.
Python Program
s = {'Apple', 'Banana', 'Mango', 'Cherry'}
result = filter(lambda x: len(x) == 5, s)
result = set(result)
print(result) Try Online Output
{'Mango', 'Apple'} Conclusion
In this Python Tutorial, we learned how to filter items of a Set in Python using filter() function, with examples.