#I plan to store this information in a python dictionary.
#Unfortunately, in order to use such classes as keys in python dictionaries
#I must define comparison operators, and a hash function.
#In retrospect I figured out it would have been easier just to use tuples
#as dictionary keys. I suppose it was a good excercise to try to do it
#using python classes instead. I'm sorry it made the code so long.
def__le__(self,other):
#return ((self.chainID < other.chainID) or ((self.chainID == other.chainID) and ((self.seqNum < other.seqNum) or ((self.seqNum == other.seqNum) and (self.iCode <= other.iCode)))))))
# instead I'll exploit python's ability to compare tuples