In the original the pydbg debugger was used, this is a great library and I used it while following along with the book but I found 3 main issues:
- Not been maintained for a while so is lacking support for x64
- Bit of a hack to get it installed had to google around a bit to get it working
- Lack of documentation, most of the time either using the books as reference or docstrings
As a replacement I came across an awesome library called WinAppDbg, as you'll see in the examples it does not have these shortcomings.