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


if __name__ == '__main__':
    for line in follow('Data/stocklog.csv'):
        fields = line.split(',')
        name = fields[0].strip('"')
        price = float(fields[1])
        change = float(fields[4])
        if change < 0:
            print(f"{name:s} {price:10.2f} {change:10.2f}")