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EDITING: backoff.py

import random
from abc import ABC, abstractmethod

class AbstractBackoff(ABC):
    """Backoff interface"""

def reset(self):
        """
        Reset internal state before an operation.
        `reset` is called once at the beginning of
        every call to `Retry.call_with_retry`
        """
        pass

@abstractmethod
    def compute(self, failures):
        """Compute backoff in seconds upon failure"""
        pass

class ConstantBackoff(AbstractBackoff):
    """Constant backoff upon failure"""

def __init__(self, backoff):
        """`backoff`: backoff time in seconds"""
        self._backoff = backoff

def compute(self, failures):
        return self._backoff

class NoBackoff(ConstantBackoff):
    """No backoff upon failure"""

def __init__(self):
        super().__init__(0)

class ExponentialBackoff(AbstractBackoff):
    """Exponential backoff upon failure"""

def __init__(self, cap, base):
        """
        `cap`: maximum backoff time in seconds
        `base`: base backoff time in seconds
        """
        self._cap = cap
        self._base = base

def compute(self, failures):
        return min(self._cap, self._base * 2**failures)

class FullJitterBackoff(AbstractBackoff):
    """Full jitter backoff upon failure"""

def __init__(self, cap, base):
        """
        `cap`: maximum backoff time in seconds
        `base`: base backoff time in seconds
        """
        self._cap = cap
        self._base = base

def compute(self, failures):
        return random.uniform(0, min(self._cap, self._base * 2**failures))

class EqualJitterBackoff(AbstractBackoff):
    """Equal jitter backoff upon failure"""

def __init__(self, cap, base):
        """
        `cap`: maximum backoff time in seconds
        `base`: base backoff time in seconds
        """
        self._cap = cap
        self._base = base

def compute(self, failures):
        temp = min(self._cap, self._base * 2**failures) / 2
        return temp + random.uniform(0, temp)

class DecorrelatedJitterBackoff(AbstractBackoff):
    """Decorrelated jitter backoff upon failure"""

def __init__(self, cap, base):
        """
        `cap`: maximum backoff time in seconds
        `base`: base backoff time in seconds
        """
        self._cap = cap
        self._base = base
        self._previous_backoff = 0

def reset(self):
        self._previous_backoff = 0

def compute(self, failures):
        max_backoff = max(self._base, self._previous_backoff * 3)
        temp = random.uniform(self._base, max_backoff)
        self._previous_backoff = min(self._cap, temp)
        return self._previous_backoff