main.py

import uvicorn

from fastapi import FastAPI, Request, Form
from fastapi.responses import HTMLResponse
from fastapi.templating import Jinja2Templates

app = FastAPI()

templates = Jinja2Templates(directory="templates")


@app.get("/rechner/", response_class=HTMLResponse)
def home(request: Request):
    return templates.TemplateResponse("home.html", {"request": request})

@app.post("/rechnen/", response_class=HTMLResponse)
async def login(request:Request, n1: str = Form(...), n2: str = Form(...), operator: str = Form(...)):
    erg = 0
    n1 = int(n1)
    n2 = int(n2)
    if(operator=="+"):
        erg = n1+n2
    elif(operator=="-"):
        erg = n1-n2
    elif(operator=="*"):
        erg = n1*n2
    else:
        erg = n1/n2
    return templates.TemplateResponse("home.html", {"request": request, "erg": erg, "operator":operator})


if __name__ == "__main__":
    uvicorn.run(app, host="localhost", port=8001)