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/usr/share/pyshared/pysnmp/nextid.py is in python-pysnmp4 4.2.2-1.

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# Return a next value in a reasonably MT-safe manner
import random

random.seed()

class Integer:
    def __init__(self, maximum, increment=256):
        self.__maximum = maximum
        if increment >= maximum:
            increment = maximum
        self.__increment = increment
        self.__threshold = increment//2
        e = random.randrange(self.__maximum - self.__increment)
        self.__bank = list(range(e, e+self.__increment))

    def __repr__(self):
        return '%s(%d, %d)' % (
            self.__class__.__name__,
            self.__maximum,
            self.__increment
            )
        
    def __call__(self):
        v = self.__bank.pop(0)
        if v % self.__threshold:
            return v
        else:
            # this is MT-safe unless too many (~ increment/2) threads
            # bump into this code simultaneously
            e = self.__bank[-1]+1
            if e > self.__maximum:
                e = 0
            self.__bank.extend(range(e, e+self.__threshold))
            return v