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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def get_my_history(self, account=None, limit=10000):
        ''' Fetches the account history from
        most recent back
        '''
        if not account:
            account = self.mainaccount
        try:
            h = self.steem_instance().get_account_history(
                account, -1, limit)
        except Exception as e:
            self.msg.error_message(e)
            return False
        else:
            return h