Understanding the code
The following is the code that we are going to be looking at in this chapter:
from datetime import datetime
from .stock import Stock
from .rule import PriceRule
class AlertProcessor:
def __init__(self):
self.exchange = {"GOOG": Stock("GOOG"), "AAPL": Stock("AAPL")}
rule_1 = PriceRule("GOOG", lambda stock: stock.price > 10)
rule_2 = PriceRule("AAPL", lambda stock: stock.price > 5)
self.exchange["GOOG"].updated.connect(
lambda stock: print(stock.symbol, stock.price) \
if rule_1.matches(self.exchange) else None)
self.exchange["AAPL"].updated.connect(
lambda stock: print(stock.symbol, stock.price) \
if rule_2.matches(self.exchange) else None)
updates = []
with open("updates.csv", "r") as fp:
for line in fp.readlines():
symbol...
