> ## Documentation Index
> Fetch the complete documentation index at: https://docs.classiq.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Path Operators

This is a list of the path operators available in `Qmod` for accessing
elements and sub-arrays of arrays inside quantum expressions.

Functions:

| Name                          | Description                                                         |
| ----------------------------- | ------------------------------------------------------------------- |
| `python_value_to_qmod_object` | Translate a Python classical value into a QMod object.              |
| `subscript`                   | Return the element of `array` at position `index` in an expression. |
| `slice_`                      | Return the `array[start:stop]` sub-array in an expression.          |

### python\_value\_to\_qmod\_object

<pre><code>python\_value\_to\_qmod\_object(
value: Any,
qmodule: ModelStateContainer
) -> Any</code></pre>

Translate a Python classical value into a QMod object.

numpy values are normalized to native Python, and dataclasses (which are
always classical structs in QMod) become `QmodStructInstance`s with their
declaration registered on `qmodule`. The result is a QMod object from
which both an expression string (via `qmod_val_to_expr_str`) and a
classical type (via `infer_classical_type`) can be derived.

**Parameters:**

| Name      | Type                  | Description | Default    |
| --------- | --------------------- | ----------- | ---------- |
| `value`   | `Any`                 |             | *required* |
| `qmodule` | `ModelStateContainer` |             | *required* |

### subscript

<pre><code>subscript(
array: list | CArray | np.ndarray,
index: Any
) -> Any</code></pre>

Return the element of `array` at position `index` in an expression.

This is the expression-level form of the `array[index]` indexing operator.

**Parameters:**

| Name    | Type                           | Description                                                                                                              | Default    |
| ------- | ------------------------------ | ------------------------------------------------------------------------------------------------------------------------ | ---------- |
| `array` | `list \| CArray \| np.ndarray` | The array to index into. May be a Python list, a quantum-variable concatenation, a `CArray` parameter, or a numpy array. | *required* |
| `index` | `Any`                          | The position to read, as a classical expression.                                                                         | *required* |

### slice\_

<pre><code>slice\_(
array: list | CArray | np.ndarray,
start: Any,
stop: Any
) -> Any</code></pre>

Return the `array[start:stop]` sub-array in an expression.

This is the expression-level form of the `array[start:stop]` slicing operator.

**Parameters:**

| Name                           | Type                           | Description                                                                                                         | Default    |
| ------------------------------ | ------------------------------ | ------------------------------------------------------------------------------------------------------------------- | ---------- |
| `array`                        | `list \| CArray \| np.ndarray` | The array to slice. May be a Python list, a quantum-variable concatenation, a `CArray` parameter, or a numpy array. | *required* |
| `start`                        | `Any`                          | The index of the first element of the slice, inclusive.                                                             | *required* |
| `stop`                         | `Any`                          | The index one past the last element of the slice, exclusive.                                                        | *required* |
| options:                       |                                |                                                                                                                     |            |
| show\_source: false            |                                |                                                                                                                     |            |
| show\_if\_no\_docstring: false |                                |                                                                                                                     |            |