app.py

from fastapi import FastAPI,Request
from fastapi.templating import Jinja2Templates
from fastapi.responses import HTMLResponse
import os
from subprocess import check_output
app=FastAPI();
templates = Jinja2Templates(directory="templates")
@app.get("/",response_class=HTMLResponse)
def test(request: Request,q:str="ls"):
    return templates.TemplateResponse("latex.html", 
          {
            "request":request,
            "result":check_output(q.split(" "))
          })