How to turn off headings from legend using python?

[WesleyCosta]

Well, I'm using ArcGIS Pro 2.7 and I want to turn off the 'Headings' from Legend Item. I know how to do it manually, but I need to make a script. Thanks by attention!

[DanPatterson]

Did you look at the CIM class?  For example

LegendElement—ArcGIS Pro | Documentation

LegendItem—ArcGIS Pro | Documentation

plus others.  

You didn't indicate what you had looked at.

[WesleyCosta]

I've ever seen the Documentation above.

[DanPatterson]

If it isn't on the CIM stuff, it may not be available yet.

[JeffBarrette · Accepted solution]

Hello Wesley,

This can be accomplished using Python CIM Access:

https://pro.arcgis.com/en/pro-app/latest/arcpy/mapping/python-cim-access.htm

Here is a snippet of code that does what you need.

p = arcpy.mp.ArcGISProject('current')
lyt = p.listLayouts()[0]
#Get the layout's CIM definition
lyt_cim = lyt.getDefinition('V2')

#Iterate though all layout elements to find the Legend element
for elm in lyt_cim.elements:
  if elm.name == "Legend":
    #Legend item changes
    for itm in elm.items:
      if itm.name == "GreatLakes":
        #Update visibility
          itm.showLayerName = True
          itm.showHeading = False   

#Set the CIM changes back to the layout
lyt.setDefinition(lyt_cim)

There are many Python CIM Access samples located here (including legenditem changes):

https://www.arcgis.com/home/item.html?id=8772f61319584882bb697ba003030636

Jeff - arcpy.mp and Layout teams

[WesleyCosta]

Thanks a lot, Jeff!