Server-Side Scripting/Iteration/Python (FastAPI)
routers/lesson4.py
[edit | edit source]# Demonstrates conditions, while loops and for loops using
# Celsius and Fahrenheit temperature conversion tables.
#
# References:
# https://www.mathsisfun.com/temperature-conversion.html
# https://fastapi.tiangolo.com/tutorial/query-params/
# https://fastapi.tiangolo.com/tutorial/request-forms/
from fastapi import APIRouter, Request
from fastapi.responses import HTMLResponse
from fastapi.templating import Jinja2Templates
router = APIRouter(prefix="/lesson4")
templates = Jinja2Templates(directory="templates")
@router.get("/", response_class=HTMLResponse)
async def get_lesson4(request: Request):
return templates.TemplateResponse(
"lesson4.html",
{
"request": request,
"table": ""
}
)
@router.post("/", response_class=HTMLResponse)
async def post_lesson4(request: Request):
form = dict(await request.form())
try:
start = int(form["start"])
stop = int(form["stop"])
increment = int(form["increment"])
submit = form["submit"]
if submit == "Celsius":
result = process_celsius(start, stop, increment)
elif submit == "Fahrenheit":
result = process_fahrenheit(start, stop, increment)
else:
result = "Unknown submit value: " + submit
except Exception as exception:
result = str(exception)
return templates.TemplateResponse(
"lesson4.html",
{
"request": request,
"table": result
}
)
def process_celsius(start, stop, increment):
result = "<table><tr><th>Celsius</th><th>Fahrenheit</th></tr>"
celsius = start
while celsius <= stop:
fahrenheit = celsius * 9 / 5 + 32
result += f"<tr><td>{celsius}</td>"
result += f"<td>{fahrenheit:0.1f}</td></tr>"
celsius += increment
result += "</table>"
return result
def process_fahrenheit(start, stop, increment):
result = "<table><tr><th>Fahrenheit</th><th>Celsius</th></tr>"
for fahrenheit in range(start, stop + increment, increment):
celsius = (fahrenheit - 32) * 5 / 9
result += f"<tr><td>{fahrenheit}</td>"
result += f"<td>{celsius:0.1f}</td></tr>"
result += "</table>"
return result
templates/lesson4.html
[edit | edit source]<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Lesson 4</title>
<link rel="stylesheet" href="{{url_for('static', path='/styles.css')}}">
<style>
p {
min-height: 1em;
}
</style>
</head>
<body>
<h1>Temperature Conversion</h1>
<form method="POST">
<p><label for="start">Start:</label>
<input type="text" id="start" name="start" value="0">
</p>
<p><label for="stop">Stop:</label>
<input type="text" id="stop" name="stop" value="100">
</p>
<p><label for="increment:">Increment</label>
<input type="text" id="increment" name="increment" value="10">
</p>
<p><input type="submit" name="submit" value="Celsius">
<input type="submit" name="submit" value="Fahrenheit">
</p>
</form>
{{table|safe}}
</body>
</html>
Try It
[edit | edit source]See Server-Side Scripting/Routes and Templates/Python (FastAPI) to create a test environment.