Is it possible to use the contents of a single column csv file to limit the list of acceptable inputs for a tool in a python toolbox? I'm aware that I can use the code below to achieve my requirements, but the list I need often varies outside of ArcGIS and outside of my control and therefore the code would need regular updates.
options1 = [1, 2]
param0.filter.type = "Value List"
param0.filter.list = options1