bond_pricing

0.7.3 verified Fri May 01 auth: no python

A library for bond pricing with YTM/zero-curve and NPV, IRR, annuities. Current version 0.7.3 (requires Python >=3.0). Release cadence: irregular.

pip install bond-pricing

Common errors

error TypeError: __init__() got an unexpected keyword argument 'face_value' ↓

cause Importing from wrong module or version mismatch. Older version (<=0.6.x) used different parameter names.

fix

Upgrade to latest: pip install --upgrade bond-pricing

error AttributeError: 'Bond' object has no attribute 'ytm' ↓

cause Using an outdated version where method was named differently (e.g., 'yield_to_maturity').

fix

Update library or use bond.yield_to_maturity() for older versions.

error ValueError: Maturity must be positive ↓

cause Passing a negative or zero maturity value.

fix

Ensure maturity > 0.

gotcha Face value must be provided as a number (int or float) and cannot be a string. Passing a string will raise a TypeError. ↓

fix Ensure face_value is numeric.

deprecated The method `price_from_ytm()` is deprecated in 0.7.0 in favor of `price()`. ↓

fix Use `bond.price(ytm=0.05)` instead of `bond.price_from_ytm(0.05)`.

breaking In version 0.7.0, the `zero_curve` function signature changed: the argument `spot_rates` renamed to `rates`. ↓

fix Use keyword argument `rates` instead of `spot_rates`.

Bond
```
from bond_pricing import Bond
```
Main class for bond calculations.
zero_curve
```
from bond_pricing import zero_curve
```
Function to construct zero-coupon yield curve.
annuity
```
from bond_pricing import annuity
```
Annuity present value calculation.
irr
```
from bond_pricing import irr
```
Internal rate of return.

Create a bond and compute yield to maturity.

from bond_pricing import Bond
bond = Bond(face_value=1000, coupon_rate=0.05, maturity=10, price=950)
print(bond.ytm())