CmdStanPy pattern

from cmdstanpy import CmdStanModel

model = CmdStanModel(stan_file="model.stan")
fit = model.sample(data=data, chains=4, parallel_chains=4, seed=123)
fit.summary()

CmdStanPy is the preferred Python replacement for the book’s Stan/RStan examples because it keeps the model block readable and separates statistical modeling from sampler plumbing.

# CmdStanPy pattern

```python
from cmdstanpy import CmdStanModel

model = CmdStanModel(stan_file="model.stan")
fit = model.sample(data=data, chains=4, parallel_chains=4, seed=123)
fit.summary()
```

CmdStanPy is the preferred Python replacement for the book's Stan/RStan examples because it keeps the model block readable and separates statistical modeling from sampler plumbing.