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'''

## Exercise 6.5: Monitoring a streaming data source

## Iterator Generator (yield) example

'''

### --> first run stocksim.py in a seperate window and then run below program

import os

import time

def follow(filename):

f = open(filename)

f.seek(0,os.SEEK_END)

while True:

line = f.readline()

if line == '':

time.sleep(0.1)

continue

yield line

print("\n###################\n")

datadir = os.getcwd() + r'\work\data'

stocklogFile = datadir + r'\stocklog.csv'

'''

for line in follow(stocklogFile):

fields = line.split(',')

name = fields[0].strip('"')

price = float(fields[1])

prev = float(fields[5])

change = float(fields[4])

if change < 0:

print(f'{name:>10s} {price:>10.2f} {prev:>10.2f} {change:>10.2f}')

#print(line)

'''