Hello @Robby Stamper,
The Zero Available function (ZAV) provides a method to replace nulls with a numeric zero.
In Excel, so this function does not apply to Eikon Data API Python.
I am updating my answer to include the recommended approach, how to look this information up in Eikon Excel documentation.
Select FormulaBuilder tool from Eikon Excel:
In FormulaBuilder, select
Should see expression
ZAV() being the result of "Treat As Zero If Not Available" quick function in Expression Builder.