My issue in this task is to obtain any other then 'None' output from lookup function. After few days of fight I implement a code from yt tutorial exacly 1 to 1 and it still giving same result - 'None' from lookup. I have no idea where I may looking for the source of such behavior. Below I attaching my "quote.html" and @quote app Python code resposible in this exercise to obtain stock quotes and also lookup Python code and my terminal response when I am trying to quote any symbol.
Python code form app.py:
@app.route("/quote", methods=["GET", "POST"])
@login_required
def quote():
"""Get stock quote."""
if request.method == "POST":
symbol = request.form.get("symbol")
quote = lookup(symbol)
#if not symbol:
#return apology("Symbol field can not be empty")
if not quote:
return apology("Invalid symbol", 400)
return render_template("quote.html", quote=quote)
else:
return render_template("quote.html")
quote.html template:
{% extends "layout.html" %}
{% block title %}
Quote
{% endblock %}
{% block main %}
<h2>Get a Stock Quote</h2>
<form action="{{ url_for('quote') }}" method="post">
<label for="symbol">Symbol</label>
<input type="text" id="symbol" name="symbol" placeholder="Symbol">
<button type="submit">Get Quote</button>
</form>
{% if quote %}
<h3>{{ quote['name'] }} ({{ quote['symbol'] }})</h3>
<p>Price: {{ quote['price']|usd }}</p>
{% endif %}
{% endblock %}
Python code for lookup function:
def lookup(symbol):
"""Look up quote for symbol."""
# Prepare API request
symbol = symbol.upper()
end = datetime.datetime.now(pytz.timezone("US/Eastern"))
start = end - datetime.timedelta(days=7)
# Yahoo Finance API
url = (
f"https://query1.finance.yahoo.com/v7/finance/download/{urllib.parse.quote_plus(symbol)}"
f"?period1={int(start.timestamp())}"
f"&period2={int(end.timestamp())}"
f"&interval=1d&events=history&includeAdjustedClose=true"
)
# Query API
try:
response = requests.get(url, cookies={"session": str(uuid.uuid4())}, headers={"User-Agent": "python-requests", "Accept": "*/*"})
response.raise_for_status()
# CSV header: Date,Open,High,Low,Close,Adj Close,Volume
quotes = list(csv.DictReader(response.content.decode("utf-8").splitlines()))
quotes.reverse()
price = round(float(quotes[0]["Adj Close"]), 2)
return {
"name": symbol,
"price": price,
"symbol": symbol
}
except (requests.RequestException, ValueError, KeyError, IndexError):
return None
TERMINAL VIEW after trying to quote any symbol:
finance/ $ flask run
* Debug mode: off
INFO: WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
* Running on https://bartosz1tarka-legendary-parakeet-px6wj7xv6vw2655g-5000.app.github.dev
INFO: Press CTRL+C to quit
INFO: * Restarting with stat
INFO: 127.0.0.1 - - [28/Jul/2024 19:00:23] "GET / HTTP/1.1" 400 -
INFO: 127.0.0.1 - - [28/Jul/2024 19:00:23] "GET /static/styles.css HTTP/1.1" 200 -
INFO: 127.0.0.1 - - [28/Jul/2024 19:00:24] "GET /quote HTTP/1.1" 200 -
INFO: 127.0.0.1 - - [28/Jul/2024 19:00:25] "GET /static/styles.css HTTP/1.1" 200 -
DEBUG: Starting new HTTPS connection (1): query1.finance.yahoo.com:443
DEBUG: https://query1.finance.yahoo.com:443 "GET /v7/finance/download/AAPL?period1=1721581229&period2=1722186029&interval=1d&events=history&includeAdjustedClose=true HTTP/11" 429 19
INFO: 127.0.0.1 - - [28/Jul/2024 19:00:29] "POST /quote HTTP/1.1" 400 -
INFO: 127.0.0.1 - - [28/Jul/2024 19:00:30] "GET /static/styles.css HTTP/1.1" 200 -
I would like to find out the reason why the lookup function returns None, or at least where I should looking for issue. Thanks in advance.
This lookup function does not match the current one from cs50. Suggest getting the latest helpers.py as mentioned in the spec