The authors provide a nagg-supported free online version of the C++ and older C/Fortran editions.
If you want a Python-focused book similar in spirit to Numerical Recipes numerical recipes python pdf top
Before diving into the PDFs, let's understand the query. The original Numerical Recipes (Press, Teukolsky, Vetterling, Flannery) is famous for explaining why an algorithm works and how to implement it. However, the original code is dated. The authors provide a nagg-supported free online version