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# visualization
# `prefect.utilities.visualization`
Utilities for working with Flow\.visualize()
## Functions
### `get_task_viz_tracker`
```python theme={null}
get_task_viz_tracker() -> Optional['TaskVizTracker']
```
### `track_viz_task`
```python theme={null}
track_viz_task(is_async: bool, task_name: str, parameters: dict[str, Any], viz_return_value: Optional[Any] = None) -> Union[Coroutine[Any, Any, Any], Any]
```
Return a result if sync otherwise return a coroutine that returns the result
### `build_task_dependencies`
```python theme={null}
build_task_dependencies(task_run_tracker: TaskVizTracker) -> graphviz.Digraph
```
Constructs a Graphviz directed graph object that represents the dependencies
between tasks in the given TaskVizTracker.
* task\_run\_tracker (TaskVizTracker): An object containing tasks and their
dependencies.
* graphviz.Digraph: A directed graph object depicting the relationships and
dependencies between tasks.
Raises:
* GraphvizImportError: If there's an ImportError related to graphviz.
* FlowVisualizationError: If there's any other error during the visualization
process or if return values of tasks are directly accessed without
specifying a `viz_return_value`.
### `visualize_task_dependencies`
```python theme={null}
visualize_task_dependencies(graph: graphviz.Digraph, flow_run_name: str) -> None
```
Renders and displays a Graphviz directed graph representing task dependencies.
The graph is rendered in PNG format and saved with the name specified by
flow\_run\_name. After rendering, the visualization is opened and displayed.
Parameters:
* graph (graphviz.Digraph): The directed graph object to visualize.
* flow\_run\_name (str): The name to use when saving the rendered graph image.
Raises:
* GraphvizExecutableNotFoundError: If Graphviz isn't found on the system.
* FlowVisualizationError: If there's any other error during the visualization
process or if return values of tasks are directly accessed without
specifying a `viz_return_value`.
## Classes
### `FlowVisualizationError`
### `VisualizationUnsupportedError`
### `TaskVizTrackerState`
### `GraphvizImportError`
### `GraphvizExecutableNotFoundError`
### `VizTask`
### `TaskVizTracker`
**Methods:**
#### `add_task`
```python theme={null}
add_task(self, task: VizTask) -> None
```
#### `link_viz_return_value_to_viz_task`
```python theme={null}
link_viz_return_value_to_viz_task(self, viz_return_value: Any, viz_task: VizTask) -> None
```
We cannot track booleans, Ellipsis, None, NotImplemented, or the integers from -5 to 256
because they are singletons.
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