Registry / ai-ml / py-lets-be-rational

py-lets-be-rational

library1.0.1pypypi✓ verified 82d ago

Pure Python implementation of Peter Jaeckel's LetsBeRational, providing high-precision computation of implied volatility and option pricing using rational approximations. Current version 1.0.1, released on PyPI with no updates since 2018. Low maintenance but stable.

ai-ml data

pip install py-lets-be-rational

package ↗homepage ↗

INSTALL

IMPORT

SIG · PY-LETS-BE-RATIONA

py-lets-be-rational

ai-mlpythonv1.0.1

harness data pending

Install & Compatibility

Where this runs

No compatibility data collected yet for this library.

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

implied_volatility_from_a_transformed_rational_guess

✓ from lets_be_rational import implied_volatility_from_a_transformed_rational_guess

✗ from lets_be_rational import ImpliedVolatility

black

✓ from lets_be_rational import black

normalised_black

✓ from lets_be_rational import normalised_black

Computes implied volatility using Let's Be Rational algorithm.

from lets_be_rational import ImpliedVolatility import math iv = ImpliedVolatility() # Example: forward=1.2, strike=1.0, time to expiry=0.5, option price=0.2, call=True sigma = iv.implied_volatility(1.2, 1.0, 0.5, 0.2, True) print(f"Implied Volatility: {sigma:.6f}")

Debug

Known issues

gotchaImport from `lets_be_rational` not `py_lets_be_rational` or `letsberational`. The package is installed as `py-lets-be-rational` but the module is named `lets_be_rational`.

fix

Use `from lets_be_rational import ImpliedVolatility`.

affects: all

gotchaThe library expects forward price, not spot price. If you pass spot, results will be wrong for nonzero interest/dividends.

fix

Compute forward = spot * exp((r - q) * T) before calling.

affects: all

gotchaOption price must be a positive float. Passing zero or negative price may cause silent errors or zero division.

fix

Ensure option price > 0.

affects: all

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Version history

1.0.1latest on PyPI · released Apr 13, 2017

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Dependencies

No dependency data recorded yet.

Agent activity

7 hits · last 30 days

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Resources

packagehttps://pypi.org/project/py-lets-be-rational/ ↗

homepagehttp://jaeckel.org ↗