Unconvert zipline string

Question

Is there a way to unconvert a zipline object that was converted to a string or to find the string object in Fundamentals.columns and return the value.

This is the original type class zipline.pipeline.data.dataset.BoundColumn

Since it is in a frozen set I had to convert to string in a list to get sometype of order

for x in Fundamentals.columns:
    l.append(str(x))

l.sort()

for x in l[:5]:
     print(x)    #how do I