Checking for default value generates a KeyError if none is set

[vlsd]

Consider the following:

ts = TimeSeries()
hasattr(ts, 'default')

it results in a KeyError. First, this is a bad behavior (bug) and should be fixed. Secondly, how should one properly check if a default is set or not? Maybe a has_default() method would be useful for this?

[stringertheory]

I think throwing the KeyError: "can't get value of empty TimeSeries with no default value" might be OK here. If you want to avoid the error, I'd recommend:

ts = TimeSeries()
if not ts.is_floating():
    print(ts.default)

is_floating is similar to something like has_no_default in that it only returns True if it's an empty TimeSeries with no default value specified.