Summary
Returns a list of the available styles for generating directions from a route created during network analysis. Each directions style is appropriate for a different application.
Discussion
This function can be used in a custom script tool validation to populate a ValueList of available directions styles for the user to choose from.
Syntax
ListDirectionsStyleNames ({network_dataset_path})| Parameter | Explanation | Data Type | 
network_dataset_path  | A variable that references the catalog path of the network dataset. The catalog path of a network dataset can be obtained from the dataSource property of a network dataset layer or a network analysis layer object. It can also be obtained from the catalogPath property of a network dataset describe object. The parameter also accepts a network dataset layer object.  | String | 
| Data Type | Explanation | 
| String | The list of available directions styles containing strings representing the styles installed on your machine. It is a subset of the following styles: 
  | 
Code sample
Lists supported directions styles.
# Create a list of available directions styles
dir_styles = arcpy.na.ListDirectionsStyleNames()