'Initialises the SignalEvent.
Parameters:
ticker - The ticker symbol, e.g. \'GOOG\'.
action - \'BOT\' (for long) or \'SLD\' (for short).
suggested_quantity - Optional positively valued integer
representing a suggested absolute quantity of units
of an asset to transact in, which is used by the
PositionSizer and RiskManager.'

def __init__(self, ticker, action, suggested_quantity=None):

    self.type = EventType.SIGNAL
    self.ticker = ticker
    self.action = action
    self.suggested_quantity = suggested_quantity
