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Python Dictionary | pop method

schedule Aug 12, 2023
Last updated
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Python
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Python's `dict.pop(~)` method removes the key/value pair at the given key from a dictionary and then returns the removed value.

Parameters

1. `key` | `any type`

The key of the key/value pair to be removed from the dictionary.

2. `default` | `any type` | `optional`

The default value to return if the specified key is not present in the dictionary.

Return value

Case

Return value

`key` is present in dictionary

value corresponding to `key`

`key` is not present and `default` value provided

`default` value

`key` is not present and no `default` value provided

`KeyError`

Examples

Basic usage

To remove the key/value pair for `"Emma"` and return its corresponding value:

``` test_scores = {"Mike": 3, "Adam": 5,"Emma": 7}print("Emma's score was ", test_scores.pop("Emma"))print("The remaining dictionary is ", test_scores) Emma's score was 7The remaining dictionary is {'Mike': 3, 'Adam': 5} ```

We remove the key `"Emma"` from `test_scores` dictionary and then return the corresponding value of `7`.

Default parameter

To remove the key/value pair for `"Kate"` and return the value:

``` test_scores = {"Mike": 3, "Adam": 5,"Emma": 7}print("Kate's score was ", test_scores.pop("Kate", "N/A")) Kate's score was N/A ```

The default argument `"N/A"` is returned as `"Kate"` was not found in dictionary `test_scores`.

KeyError

If we do not provide a `default` argument, and the `key` does not exist in the dictionary, `KeyError` is raised:

``` test_scores = {"Mike": 3, "Adam": 5,"Emma": 7}print("Kate's score was ", test_scores.pop("Kate")) KeyError: 'Kate' ```
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