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from __future__ import absolute_import

from threading import local

class TransactionContext(object):
    def __init__(self, stack, context):
        self.stack = stack
        self.context = context

def __enter__(self):
        self.stack.push(self.context)
        return self

def __exit__(self, *exc_info):
        self.stack.pop(self.context)

class TransactionStack(local):
    def __init__(self):
        self.stack = []

def __len__(self):
        return len(self.stack)

def __iter__(self):
        return iter(self.stack)

def __call__(self, context):
        return TransactionContext(self, context)

def clear(self):
        self.stack = []

def peek(self):
        try:
            return self.stack[-1]
        except IndexError:
            return None

def push(self, context):
        self.stack.append(context)
        return context

def pop(self, context=None):
        if context is None:
            return self.stack.pop()

while self.stack:
            if self.stack.pop() is context:
                return context