我正在尝试构建一个用于教学目的的演示（对此完全陌生）。后端Python代码位于main.py中，放置在myproject/文件夹下。前端html代码位于index.html中，位于myproject/templates/文件夹下。
我在这篇文章的底部附加了两个文件。当我在网络浏览器中输入 http://127.0.0.1:5000 时，出现以下错误页面。有人可以帮我吗？
Traceback (most recent call last):
File "C:\Users\wang0105\AppData\Local\anaconda3\Lib\site-packages\flask\app.py", line 2552, in __call__
return self.wsgi_app(environ, start_response)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\wang0105\AppData\Local\anaconda3\Lib\site-packages\flask\app.py", line 2532, in wsgi_app
response = self.handle_exception(e)
^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\wang0105\AppData\Local\anaconda3\Lib\site-packages\flask\app.py", line 2529, in wsgi_app
response = self.full_dispatch_request()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\wang0105\AppData\Local\anaconda3\Lib\site-packages\flask\app.py", line 1825, in full_dispatch_request
rv = self.handle_user_exception(e)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\wang0105\AppData\Local\anaconda3\Lib\site-packages\flask\app.py", line 1823, in full_dispatch_request
rv = self.dispatch_request()
^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\wang0105\AppData\Local\anaconda3\Lib\site-packages\flask\app.py", line 1799, in dispatch_request
return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "c:\Users\wang0105\.vscode\first.py", line 52, in index
return render_template('index.html')
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\wang0105\AppData\Local\anaconda3\Lib\site-packages\flask\templating.py", line 146, in render_template
template = app.jinja_env.get_or_select_template(template_name_or_list)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\wang0105\AppData\Local\anaconda3\Lib\site-packages\jinja2\environment.py", line 1081, in get_or_select_template
return self.get_template(template_name_or_list, parent, globals)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\wang0105\AppData\Local\anaconda3\Lib\site-packages\jinja2\environment.py", line 1010, in get_template
return self._load_template(name, globals)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\wang0105\AppData\Local\anaconda3\Lib\site-packages\jinja2\environment.py", line 969, in _load_template
template = self.loader.load(self, name, self.make_globals(globals))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\wang0105\AppData\Local\anaconda3\Lib\site-packages\jinja2\loaders.py", line 125, in load
source, filename, uptodate = self.get_source(environment, name)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\wang0105\AppData\Local\anaconda3\Lib\site-packages\flask\templating.py", line 62, in get_source
return self._get_source_fast(environment, template)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\wang0105\AppData\Local\anaconda3\Lib\site-packages\flask\templating.py", line 98, in _get_source_fast
raise TemplateNotFound(template)
jinja2.exceptions.TemplateNotFound: index.html
from flask import Flask, request, jsonify, render_template
from collections import defaultdict
app = Flask(__name__)
# Order book structure
order_book = {
'buy': defaultdict(list), # Buy orders (price -> list of orders)
'sell': defaultdict(list) # Sell orders (price -> list of orders)
}
# Process a new order
def process_order(order):
order_type = order['type']
price = order['price']
quantity = order['quantity']
side = order['side']
if order_type == 'market':
# Market order logic
if side == 'buy':
fulfill_order('sell', quantity)
elif side == 'sell':
fulfill_order('buy', quantity)
elif order_type == 'limit':
# Limit order logic
order_book[side][price].append(quantity)
def fulfill_order(side, quantity):
opposite_side = 'buy' if side == 'sell' else 'sell'
prices = sorted(order_book[opposite_side].keys(), reverse=(side == 'buy'))
for price in prices:
orders = order_book[opposite_side][price]
for i in range(len(orders)):
if quantity == 0:
break
if orders[i] <= quantity:
quantity -= orders[i]
orders[i] = 0
else:
orders[i] -= quantity
quantity = 0
# Remove fulfilled orders
order_book[opposite_side][price] = [q for q in orders if q > 0]
if not order_book[opposite_side][price]:
del order_book[opposite_side][price]
@app.route('/')
def index():
return render_template('index.html')
@app.route('/submit_order', methods=['POST'])
def submit_order():
order = request.json
process_order(order)
return jsonify(order_book)
@app.route('/order_book')
def get_order_book():
return jsonify(order_book)
if __name__ == '__main__':
app.run(debug=True)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Trading Game</title>
<script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
</head>
<body>
<h1>Trading Game</h1>
<form id="orderForm">
<label for="orderType">Order Type:</label>
<select id="orderType">
<option value="limit">Limit</option>
<option value="market">Market</option>
</select>
<label for="side">Side:</label>
<select id="side">
<option value="buy">Buy</option>
<option value="sell">Sell</option>
</select>
<label for="price">Price:</label>
<input type="number" id="price" step="0.01">
<label for="quantity">Quantity:</label>
<input type="number" id="quantity">
<button type="submit">Submit Order</button>
</form>
<canvas id="orderBookChart" width="600" height="400"></canvas>
<script>
async function fetchOrderBook() {
const response = await fetch('/order_book');
return await response.json();
}
function renderOrderBook(orderBook) {
const ctx = document.getElementById('orderBookChart').getContext('2d');
const buyOrders = Object.entries(orderBook.buy).map(([price, orders]) => ({
price: parseFloat(price),
quantity: orders.reduce((a, b) => a + b, 0)
})).sort((a, b) => a.price - b.price);
const sellOrders = Object.entries(orderBook.sell).map(([price, orders]) => ({
price: parseFloat(price),
quantity: orders.reduce((a, b) => a + b, 0)
})).sort((a, b) => a.price - b.price);
const data = {
labels: [...buyOrders.map(o => o.price), ...sellOrders.map(o => o.price)],
datasets: [
{
label: 'Buy Orders',
data: buyOrders.map(o => o.quantity),
backgroundColor: 'green',
},
{
label: 'Sell Orders',
data: sellOrders.map(o => o.quantity),
backgroundColor: 'red',
}
]
};
new Chart(ctx, {
type: 'bar',
data: data,
options: {
scales: {
x: { title: { display: true, text: 'Price' } },
y: { title: { display: true, text: 'Quantity' } }
}
}
});
}
document.getElementById('orderForm').addEventListener('submit', async function (e) {
e.preventDefault();
const order = {
type: document.getElementById('orderType').value,
side: document.getElementById('side').value,
price: parseFloat(document.getElementById('price').value),
quantity: parseInt(document.getElementById('quantity').value)
};
const response = await fetch('/submit_order', {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify(order)
});
const orderBook = await response.json();
renderOrderBook(orderBook);
});
document.addEventListener('DOMContentLoaded', async function () {
const orderBook = await fetchOrderBook();
renderOrderBook(orderBook);
});
</script>
</body>
</html>
`
我认为问题在于您是从
myproject/试试这个：
cd myproject/
python main.py
应该可以正常工作。
Flask 使用与您当前运行位置相关的模板。例如，运行
python myproject/main.py