shakeebshaan

"""Async retry decorator with exponential backoff + jitter.

@retry(tries=5, base=0.5)
async def fetch_price(symbol: str) -> float:
    async with aiohttp.ClientSession() as s:
        async with s.get(url) as r:
            r.raise_for_status()
            return (await r.json())["price"]
"""
import asyncio

shakeebshaan

/**
 * useDebounce — delays a value update until input settles.
 * Perfect for search boxes, API calls, expensive re-renders.
 *
 *   const [q, setQ] = useState("");
 *   const debounced = useDebounce(q, 300);
 *   useEffect(() => { search(debounced); }, [debounced]);
 */
import { useEffect, useState } from "react";

shakeebshaan

"""Minimal FastAPI JWT auth — login + protected route + dependency."""
from datetime import datetime, timedelta, timezone

import jwt
from fastapi import Depends, FastAPI, HTTPException, status
from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
from passlib.hash import bcrypt

SECRET = "change-me-in-prod"
ALGO = "HS256"

shakeebshaan

"""RSI (Relative Strength Index) — pure pandas, vectorized, no loops.

Usage:
    import pandas as pd
    df = pd.read_csv("btc.csv")
    df["rsi"] = rsi(df["close"], period=14)
"""
import pandas as pd