Check the constant settings at the top of OP_RETURN.py. If you just installed Dogecoin Core, wait for it to download and verify old blocks. If using as a library, add 'from OP_RETURN import *' in your ...

About XIRR (using Python) to calculate return on investments done at different time periods which need not be periodic.

When you install Python on Mac, the system adds it to your path by default. If you can't run your Python commands from the terminal, something may have gone wrong during the installation process or ...