A brain teaser

.vscode/launch.json

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+{
+    "configurations": [
+        {
+            "name": "Python: HotdogSimulation",
+            "type": "python",
+            "request": "launch",
+            "program": "simulation/SimulationRunner.py",
+            "justMyCode": true,
+            "args": "./HotdogSimulation.py"
+        }
+    ]
+}

A_BrainTeaser_byScott.py

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+# A quick brain teaser
+print('What has a head and a tail but no body?')
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+# A coin

README.md

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 GTSP Python Bootcamp
 
-This bootcamp is intended for OTP interns with a math and applied analysis
+This bootcamp is intended for OPT interns with a math and applied analysis
 background to get up to speed quickly on how to use Python for practical
 commercial work.  It is not intended for large classes above 2-3 study groups
 of a maximum of 4 students each.

http-performance/Webpage.ipynb

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+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "0593e529",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import os\n",
+    "from urllib.parse import urlparse\n",
+    "\n",
+    "class JPEGRequestHandler:\n",
+    "    def __init__(self, app):\n",
+    "        self.app = app\n",
+    "\n",
+    "    def __call__(self, environ, start_response):\n",
+    "        url = urlparse(environ['REQUEST_URI'])\n",
+    "        path = url.path\n",
+    "\n",
+    "        if path.endswith('.jpg'):\n",
+    "            file_path = path[1:]\n",
+    "\n",
+    "            if os.path.isfile(file_path):\n",
+    "                with open(file_path, 'rb') as file:\n",
+    "                    response_body = file.read()\n",
+    "                    status = '200 OK'\n",
+    "                    headers = [('Content-type', 'image/jpeg'),\n",
+    "                               ('Content-Length', str(len(response_body)))]\n",
+    "\n",
+    "                    start_response(status, headers)\n",
+    "                    return [response_body]\n",
+    "            else:\n",
+    "                status = '404 Not Found'\n",
+    "                headers = [('Content-type', 'text/plain'),\n",
+    "                           ('Content-Length', '0')]\n",
+    "\n",
+    "                start_response(status, headers)\n",
+    "                return []\n",
+    "        else:\n",
+    "            status = '403 Forbidden'\n",
+    "            headers = [('Content-type', 'text/plain'),\n",
+    "                       ('Content-Length', '0')]\n",
+    "\n",
+    "            start_response(status, headers)\n",
+    "            return []\n",
+    "\n",
+    "if __name__ == '__main__':\n",
+    "    from werkzeug.serving import run_simple\n",
+    "    from werkzeug.middleware.dispatcher import DispatcherMiddleware\n",
+    "\n",
+    "    app = DispatcherMiddleware(JPEGRequestHandler(app), {'/': app})\n",
+    "    run_simple('0.0.0.0', 8000, app, use_reloader=True)"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3 (ipykernel)",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.9.13"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}

http-performance/app.py

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+import os
+from urllib.parse import urlparse
+
+class JPEGRequestHandler:
+    def __init__(self, app):
+        self.app = app
+
+    def __call__(self, environ, start_response):
+        url = urlparse(environ['REQUEST_URI'])
+        path = url.path
+
+        if path.endswith('.jpg'):
+            file_path = path[1:]
+
+            if os.path.isfile(file_path):
+                with open(file_path, 'rb') as file:
+                    response_body = file.read()
+                    status = '200 OK'
+                    headers = [('Content-type', 'image/jpeg'),
+                               ('Content-Length', str(len(response_body)))]
+
+                    start_response(status, headers)
+                    return [response_body]
+            else:
+                status = '404 Not Found'
+                headers = [('Content-type', 'text/plain'),
+                           ('Content-Length', '0')]
+
+                start_response(status, headers)
+                return []
+        else:
+            status = '403 Forbidden'
+            headers = [('Content-type', 'text/plain'),
+                       ('Content-Length', '0')]
+
+            start_response(status, headers)
+            return []
+
+if __name__ == '__main__':
+    from werkzeug.serving import run_simple
+    from werkzeug.middleware.dispatcher import DispatcherMiddleware
+
+    app = DispatcherMiddleware(JPEGRequestHandler(app), {'/': app})
+    run_simple('0.0.0.0', 8000, app, use_reloader=True)

http-performance/httpserver.py

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+import os
+from http.server import SimpleHTTPRequestHandler, HTTPServer
+from urllib.parse import urlparse
+
+class JPEGRequestHandler(SimpleHTTPRequestHandler):
+    def do_GET(self):
+        url = urlparse(self.path)
+        path = url.path
+        if path.endswith('.jpg'):
+            file_path = path[1:]
+
+            if os.path.isfile(file_path):
+                self.send_response(200)
+                self.send_header('Content-Type', 'image/jpeg')
+                self.end_headers()
+
+                with open(file_path, 'rb') as file:
+                    self.wfile.write(file.read())
+            else:
+                self.send_error(404, 'File not found')
+        else:
+            self.send_error(403, 'Only .jpg files are allowed')
+
+def run(server_class=HTTPServer, handler_class=JPEGRequestHandler, port=8000):
+    server_address = ('', port)
+    httpd = server_class(server_address, handler_class)
+    print(f'Serving JPEGs on port {port}...')
+    httpd.serve_forever()
+
+if __name__ == '__main__':
+    run()

http-performance/index.html

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+<!DOCTYPE html>
+<html>
+    <head>
+        <meta charset="UTF-8">
+        <meta name="viewport" content="width=device-width, initial-scale=1.0">
+        <title>D3.js Image Loading Time Graph</title>
+        <script src="https://d3js.org/d3.v5.min.js"></script>
+        <style>
+            /* Add some basic styling for the chart */
+            .bar {
+                fill: steelblue;
+            }
+    
+            .bar:hover {
+                fill: brown;
+            }
+    
+            .axis {
+                font: 10px sans-serif;
+            }
+    
+            .axis path,
+            .axis line {
+                fill: none;
+                stroke: #000;
+                shape-rendering: crispEdges;
+            }
+        </style>
+    </head>
+    <body>
+        <div id="chart"></div>
+        <div id="stats"></div>
+        <script>
+        // Generate the list of image URLs named kublai0.jpg to kublai118.jpg
+        const numberOfImages = 119;
+        const imagePrefix = 'http://localhost:8000/kublai';
+        const imageExtension = '.jpg';
+        const images = [];
+
+        for (let i = 0; i < numberOfImages; i++) {
+            const imageName = `${imagePrefix}${i}${imageExtension}`;
+            images.push(imageName);
+        }
+
+        // Disable caching using cache-buster technique
+        const cacheBuster = (url) => `${url}?${new Date().getTime()}`;
+
+        // Load images and measure their loading times
+        const loadImages = async () => {
+            const loadingTimes = [];
+
+            for (const url of images) {
+                const startTime = performance.now();
+                const img = new Image();
+                img.src = cacheBuster(url);
+                img.style.display = 'none';
+                document.body.appendChild(img);
+
+                await new Promise((resolve) => {
+                    img.onload = () => {
+                        const endTime = performance.now();
+                        loadingTimes.push(endTime - startTime);
+                        resolve();
+                    };
+                });
+            }
+
+            return loadingTimes;
+        };
+
+        // Create a D3.js bar chart to visualize loading times
+        const createChart = (data) => {
+            const margin = { top: 20, right: 20, bottom: 30, left: 40 },
+                width = 1280 - margin.left - margin.right,
+                height = 500 - margin.top - margin.bottom;
+
+            const x = d3.scaleBand().rangeRound([0, width]).padding(0.1);
+            const y = d3.scaleLinear().rangeRound([height, 0]);
+
+            const svg = d3.select('#chart')
+                .append('svg')
+                .attr('width', width + margin.left + margin.right)
+                .attr('height', height + margin.top + margin.bottom)
+                .append('g')
+                .attr('transform', `translate(${margin.left},${margin.top})`);
+
+            x.domain(data.map((d, i) => i));
+            y.domain([0, d3.max(data)]);
+
+            svg.append('g')
+                .attr('class', 'axis axis--x')
+                .attr('transform', `translate(0,${height})`)
+                .call(d3.axisBottom(x));
+
+            svg.append('g')
+                .attr('class', 'axis axis--y')
+                .call(d3.axisLeft(y).ticks(10))
+                .append('text')
+                .attr('transform', 'rotate(-90)')
+                .attr('y', 6)
+                .attr('dy', '0.71em')
+                .attr('text-anchor', 'end')
+                .text('Loading Time (ms)');
+
+            svg.selectAll('.bar')
+                .data(data)
+                .enter().append('rect')
+                .attr('class', 'bar')
+                .attr('x', (d, i) => x(i))
+                .attr('y', (d) => y(d))
+                .attr('width', x.bandwidth())
+                .attr('height', (d) => height - y(d));
+
+            const stats = document.getElementById('stats');
+            let textContent = '';
+            let average = 0;
+            let sum = 0;
+            let min = parseFloat(data[0]);
+            let max = parseFloat(data[0]);
+            for(datum of data) {
+                loadingTime = parseFloat(datum)
+                sum = sum + loadingTime
+                if(loadingTime > max) {
+                    max = loadingTime;
+                }
+                if(loadingTime < min) {
+                    min = loadingTime;
+                }
+            }
+            average = sum / data.length
+            textContent = 
+                'Total: ' + sum + 
+                ' Average: ' + average + 
+                ' Min: ' + min + 
+                ' Max: ' + max;
+            stats.textContent = textContent;
+        };
+
+        // Load images and create the chart
+        (async () => {
+            const loadingTimes = await loadImages();
+            createChart(loadingTimes);
+        })();
+    </script>
+</body>
+</html>