def at(self, ticker, current_date):
# Cache quotes array to avoid re-reading the file when asked for the same ticker twice in a row
if ticker != self._last_ticker or not self.quotes:
# parse the historical quotes file for the given ticker
self.quotes = parse_historical_quotes_file(ticker, self._quotes_dir, self._has_header)
self._last_ticker = ticker
# if the requested date is outside the file's date range raise exception
if not self.quotes or current_date < self.quotes.keys()[-1] or current_date > self.quotes.keys()[0]:
raise DatesNotAvailableException
# return the quote on the closest date within the range
return float(self.quotes[find_closest(self.quotes.keys(), current_date)])
def get_price_change(ticker, start_date, end_date):
with open(HISTORICAL_QUOTES_PATH + ticker.upper() + '.txt', 'r') as fp:
# build quotes list for the selected stock
quotes = OrderedDefaultdict(list)
cp = csv.reader(fp)
try:
cp.next() # skip header line
except StopIteration:
raise DatesNotAvailableException
for l in cp:
if len(l) < FIELD_QUOTE_PRICE:
continue
quotes[datetime.strptime(l[FIELD_QUOTE_DATE], QUOTES_DATE_FORMAT)] = float(l[FIELD_QUOTE_PRICE])
if not quotes or start_date < quotes.keys()[-1] or end_date > quotes.keys()[0]:
raise DatesNotAvailableException
start = quotes[find_closest(quotes.keys(), start_date)]
end = quotes[find_closest(quotes.keys(), end_date)]
return start, end, end / start
def get_price_change(ticker, start_date, end_date):
with open(HISTORICAL_QUOTES_PATH + ticker.upper() + ".txt", "r") as fp:
# build quotes list for the selected stock
quotes = OrderedDefaultdict(list)
cp = csv.reader(fp)
try:
cp.next() # skip header line
except StopIteration:
raise DatesNotAvailableException
for l in cp:
if len(l) < FIELD_QUOTE_PRICE:
continue
quotes[datetime.strptime(l[FIELD_QUOTE_DATE], QUOTES_DATE_FORMAT)] = float(l[FIELD_QUOTE_PRICE])
if not quotes or start_date < quotes.keys()[-1] or end_date > quotes.keys()[0]:
raise DatesNotAvailableException
start = quotes[find_closest(quotes.keys(), start_date)]
end = quotes[find_closest(quotes.keys(), end_date)]
return start, end, end / start
