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# Removing elements from a set in Python

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Set Operations
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schedule Jul 1, 2022
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We can remove an element from a set in Python using either the `discard(~)` method or the `remove(~)` method. The `discard(~)` method does not raise an exception if the element we try to remove is not present in the set, while the `remove(~)` method will.

# Examples

## Removing a single element

### Discard method

Removing the element `3` from set `a`:

``` a = {1, 2, 3}a.discard(3)print(a) {1, 2} ```

No exception is raised if the element we try to remove does not exist:

``` a = {1, 2, 3}a.discard(4)print(a) {1, 2, 3} ```

### Remove method

Removing the element `3` from set `a`:

``` a = {1, 2, 3}a.remove(3)print(a) {1, 2} ```

An exception is raised if the element we try to remove does not exist:

``` a = {1, 2, 3}a.remove(4) # Causes an error!print(a) ---------------------------------------------------------------------------KeyError Traceback (most recent call last) ```

## Removing multiple elements

To remove multiple elements, use the `different_update(~)` method:

``` set_of_num = set([5,3,1])to_delete = [1,2,4,5]set_of_num.difference_update(to_delete)print(set_of_num) {3} ```

Equivalently, we can use the `-` operator with another set:

``` set_of_num = set([5,3,1])to_delete = set([1,2,4,5])print(set_of_num - to_delete) {3} ```
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Published by Arthur Yanagisawa
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