Tag read gives you a qualified value. Update line 4 as follows to extract the tag value from the qualified value you placed into Last variable in line 1.
In general, you can print the type of an object using:
print type(Last)
This would then tell you that Last was in fact a QualifiedValue, as witman said. You could then look this up in the ignition api, or look up the function you’re using that returns that value (system.tag.read) in the user manual and it’ll tell you as well