Research

Python Sandbox

A real CPython runtime running in your browser via Pyodide. NumPy, pandas, and a built-in qp module for prices and backtests.

Exercise

Calculate Simple Return

Implement the simple return formula r = (P_end - P_start) / P_start and print the result for a 100 → 110 move.

Hints

  • ▸Simple return is percent change from start to end.
  • ▸Use (end - start) / start.

qp module

import qp
qp.tickers()
qp.prices('AAPL', days=1825)
qp.backtest(
  'AAPL',
  signal,        # list, len == len(prices)
  cost_bps=5,
)

First run downloads the Python runtime (~10 MB) — subsequent runs are instant.

Idle

stdout

python 3.12 · pyodide

(no output yet — click Run)