class Transaction:
	def __init__(self):
		self.time = None
		self.price = None
		self.unit = 0
		self.type = None

	def __init__(self, item):
		self.time = item['transaction_date']
		self.price = int(item['price'])
		self.unit = float(item['units_traded'])
		self.type = item['type']

	def __str__(self, **kwargs):
		return '[{}] {} {}'.format(self.time, self.type, self.price)