# follow.py

import os

import time

def follow(filename):

'''

Generator function to produce data for consumers

:param filename: file to read latest data added to the bottom

'''

f = open(filename)

f.seek(0, os.SEEK_END) # Move file pointer 0 bytes from end of file

while True:

line = f.readline()

if line == '':

time.sleep(0.1) # Sleep briefly and retry

continue

yield line

if __name__ == '__main__':

import report

portfolio = report.read_portfolio('.\\Data\\portfolio.csv')

for line in follow('.\\Data\\stocklog.csv'):

fields = line.split(',')

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

price = float(fields[1])

change = float(fields[4])

if name in portfolio:

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