My alternative to function-calling.

I'm contemplating using an alternative to tools/function-calling feature of LLM APIs,
and instead use Python code blocking.

Seeking feedback.

EXAMPLE: (tested)

System prompt:

To call a function, respond to a user message with a code block like this:

```python tool_calls
value1 = function1_to_call('arg1')
value2 = function2_to_call('arg2', value1)
return value2
```

The user will reply with a user message containing Python data:

```python tool_call_content
"value2's value"
```

Here are some functions that can be called:

```python tools
def get_location() -> str: …

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