Creating 3D arcpy.Polyline?

Question

Working with ArcGIS Pro 2.2, I have to create a 3D polyline from array of XYZ coordinates.

When I try this code snippet :

array = arcpy.Array([arcpy.Point(0, 0, 0),arcpy.Point(0, 100, -1000)])
polyline = arcpy.Polyline(array, has_z=True)

I get an error saying that has_z is read-only:

AttributeError: DescribeGeometry: Read-only attribute has_z

From the docs it really does not seem so.

When I try not to specify the has_z parameter:

array = arcpy.Array([arcpy.Point(0, 0, 0),arcpy.Point(0, 100, -1000)])
polyline = arcpy.Polyline(array)

I receive no errors but the Polyline defaults to hasz=False as it has to.

Doing polyline.firstPoint confirms this:

<Point (0.0, 0.0, #, #)>

Is there another legit way to do it?

It seems wrong to me that has_z parameter is read-only.

Answer 1

Ok, I made it myself. I think this is a bug probably.

Using positional parameters rather than name parameters, there's no error. This is the code I succesfully used to create a 3D polyline, hope it helps. I'll probably report this to Esri.

array = arcpy.Array([arcpy.Point(0, 0, 0),arcpy.Point(0, 100, -1000)])
polyline = arcpy.Polyline(array, None, True)
polyline.firstPoint
>>> <Point (0.0, 0.0, 0.0, #)> #CORRECT!

EDIT

Here is the link to the GeoNet thread I opened.