It seems to be caused by the presence of:
nlIter = re.finditer('\n',self.raw) 
in one of the methods of one of the class methods. 

So, I moved the work to a separate function (not method):
    def initNewLines(self):
        self.newLines = findNewLines(self.raw)


def findNewLines( searchIn):
    ''' given a string return a list with the indices of each \n character 
'''
    result = []
    for nl in  re.finditer('\n', searchIn):
        result.append(nl.start) 
    return result

But it still doesn't seem to work.  If I change it to self.newlines = [], 
web2py pickles the session fine. 
confused... 

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