he-017

# HumanEval/17

Implement a file **`solution.py`** that completes the function below. Keep the given name and signature; your file must define it at module level.

```python
from typing import List


def parse_music(music_string: str) -> List[int]:
    """ Input to this function is a string representing musical notes in a special ASCII format.
    Your task is to parse this string and return list of integers corresponding to how many beats does each
    not last.

    Here is a legend:
    'o' - whole note, lasts four beats
    'o|' - half note, lasts two beats
    '.|' - quater note, lasts one beat

    >>> parse_music('o o| .| o| o| .| .| .| .| o o')
    [4, 2, 1, 2, 2, 1, 1, 1, 1, 4, 4]
    """
```

<!-- imported from OpenAI HumanEval (HumanEval/17) -->

# Auto-generated from OpenAI HumanEval HumanEval/17. Do not edit by hand.
from solution import *  # noqa: F401,F403 (prompt helpers may be referenced by tests)
from solution import parse_music as candidate

METADATA = {
    'author': 'jt',
    'dataset': 'test'
}


def check(candidate):
    assert candidate('') == []
    assert candidate('o o o o') == [4, 4, 4, 4]
    assert candidate('.| .| .| .|') == [1, 1, 1, 1]
    assert candidate('o| o| .| .| o o o o') == [2, 2, 1, 1, 4, 4, 4, 4]
    assert candidate('o| .| o| .| o o| o o|') == [2, 1, 2, 1, 4, 2, 4, 2]


def test_he_017():
    check(candidate)

You are an expert programmer. Solve the task exactly as specified. Output your solution as fenced code blocks using the required file name(s) and the exact function/type signatures requested. Prefer correctness; do not include prose outside code unless asked.

To solve this problem, we need to parse a string representing musical notes in a special ASCII format and convert it into a list of integers where each integer corresponds to the number of beats each note lasts. The notes are given in the format 'o', 'o|', and '.|', which correspond to whole notes, half notes, and quarter notes respectively.

### Approach
1. **Split the Input String**: The input string is split into individual note strings using whitespace as the delimiter. This gives us a list of note strings.
2. **Determine Beats for Each Note**: For each note string, determine the number of beats it lasts based on its type:
   - 'o' corresponds to 4 beats.
   - 'o|' corresponds to 2 beats.
   - '.|' corresponds to 1 beat.
3. **Collect Beats**: Collect the number of beats for each note into a list and return this list as the result.

### Solution Code
```python
from typing import List

def parse_music(music_string: str) -> List[int]:
    notes = music_string.split()
    beats = []
    for note in notes:
        if note == 'o':
            beats.append(4)
        elif note == 'o|':
            beats.append(2)
        elif note == '.|':
            beats.append(1)
    return beats
```

### Explanation
- **Splitting the String**: The `split()` method is used to break the input string into individual note strings. This handles multiple spaces and trims leading/trailing spaces automatically.
- **Mapping Notes to Beats**: Each note string is checked against the known note types ('o', 'o|', '.|') and the corresponding number of beats is appended to the result list.
- **Efficiency**: The solution efficiently processes each note in linear time, making it optimal for the given problem constraints.

This approach ensures that each note is correctly parsed and converted into the corresponding number of beats, providing the desired output list.

Okay, I need to solve this problem where I have to parse a music string into a list of integers representing the beats of each note. Let's see the problem statement again.

The input is a string with musical notes in a special ASCII format. The output should be a list of integers where each integer corresponds to the number of beats each note lasts. The legend is given as:

- 'o' is a whole note, lasts four beats.
- 'o|' is a half note, lasts two beats.
- '.|' is a quarter note, lasts one beat.

So, the function is called parse_music and takes a music_string as input, returning a list of integers.

Looking at the example provided:

Input: 'o o| .| o| o| .| .| .| .| o o'
Output: [4, 2, 1, 2, 2, 1, 1, 1, 1, 4, 4]

Wait, let me count the elements. The input has 11 notes, and the output has 11 integers. So each note is processed individually.

So, the first step is to split the input string into individual notes. But how are the notes separated? Looking at the example, the notes are separated by spaces. So, I can split the string on spaces to get each note.

But wait, in the example, the input is 'o o| .| o| o| .| .| .| .| o o'. Splitting by spaces gives ['o', 'o|', '.|', 'o|', 'o|', '.|', '.|', '.|', '.|', 'o', 'o'].

Each of these elements corresponds to a note. So, for each note, I need to determine how many beats it contributes.

So, the plan is:

1. Split the music_string into individual note strings.
2. For each note, determine its type and assign the corresponding beats.
3. Collect all these beats into a list and return it.

Now, how to determine the type of each note.

Looking at the note strings:

- 'o' is a whole note.
- 'o|' is a half note.
- '.|' is a quarter note.

So, for each note in the split list, I can check its string to see which category it falls into.

Wait, but wait: the note strings can be 'o', 'o|', or '.|'. So, for each note, if it's 'o', add 4. If it's 'o|', add 2. If it's '.|', add 1.

But wait, what about other possibilities? The problem statement says these are the only notes, so I don't need to handle anything else.

So, the steps in code:

- Split the input string into parts using split(), which by default splits on whitespace.
- For each part in the resulting list:
   - if part == 'o', append 4
   - elif part == 'o|', append 2
   - elif part == '.|', append 1
   - else: Hmm, but according to the problem statement, the input will only have these notes, so maybe we don't need to handle this case.

Wait, but what if the input has other notes? Well, the problem says it's a special ASCII format, so perhaps the input is always valid. So, no need for error handling.

So, the code can be written as:

def parse_music(music_string: str) -> List[int]:
    notes = music_string.split()
    beats = []
    for note in notes:
        if note == 'o':
            beats.append(4)
        elif note == 'o|':
            beats.append(2)
        elif note == '.|':
            beats.append(1)
    return beats

Wait, but let's test this with the sample input.

Sample input: 'o o| .| o| o| .| .| .| .| o o'

Splitting gives 11 notes.

Processing each:

- 'o' → 4
- 'o|' → 2
- '.|' → 1
- 'o|' → 2
- 'o|' → 2
- '.|' → 1
- '.|' → 1
- '.|' → 1
- '.|' → 1
- 'o' →4
- 'o' →4

So the output list is [4,2,1,2,2,1,1,1,1,4,4], which matches the sample output.

So, this code should work.

Wait, but what about leading or trailing spaces? The split() function handles that by ignoring leading/trailing whitespace and treating consecutive spaces as a single separator.

So, the code should be correct.

I think that's the solution.