I'm playing with the latest Python-Steem release.
I made this little script, that adds up all my curation rewards, ever.

I'm using the Account.history function to list the rewards.
When I add them all up, the number doesn't match the _curation_rewards_ as shown by Account.export.
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## Code

    from steem import Steem
    steem = Steem(node="wss://node.steem.ws") #issues with this.piston.rocks atm
    from steem.account import Account
    from steem.amount import Amount

    account = Account("felixxx")

    reward_sum = 0

    for event in account.history(filter_by='curation_reward'): 
        reward = Amount(event['reward']).amount
        link = event['comment_permlink']
        #print(account.converter.vests_to_sp(reward), ' SP for ', link)
        reward_sum += reward

    print('reward (in vest): ', reward_sum)
    reward_sum = account.converter.vests_to_sp(reward_sum)
    print('reward (in sp): ', reward_sum)

    curation = (account.export()['curation_rewards']/1000)
    print('curation according to Account.export (in sp): ', curation)

## Result

http://i.imgur.com/EdgBgdD.png

### Shouldn't those numbers be identical ?