stock-quote

#!/usr/bin/python3
#
# Usage: stock-quote FOO [BAR]
# retrieve the given stock quote from Google
# https://finance.google.com/finance/getprices?q=FOO&p=2d&i=60
#

from __future__ import print_function
import re
import requests
import sys


def print_google_quote(stock):
    params = {
        'q': stock,
        'p': '2d', # Period: 2 days
        'i': '60', # Interval: 60 seconds
    }
    r = requests.get('https://finance.google.com/finance/getprices', params=params)
    lines = r.text.split()

    # Get the previous close.
    # We match the openings that are identified by a Unix timestamp
    # preceded by a 'a' character and read the last tick before the
    # last opening.
    openings = [(idx, line) for (idx, line) in enumerate(lines) if re.match('a\d+,.*', line)]
    if not openings:
        print('{}: no data'.format(stock))
        return
    assert len(openings) == 2
    idx = int(openings[-1][0]) - 1
    previous = float(lines[idx].split(',')[1])

    # Get the latest tick (the last line)
    current = float(lines[-1].split(',')[1])

    delta = current - previous
    delta_percent = delta / previous * 100

    print('{}: {} ({:+.2f}, {:+.2f}%)'.format(stock, current, delta, delta_percent))


if __name__ == '__main__':
    for stock in sys.argv[1:]:
        print_google_quote(stock)