excel-irr
There are 2 repositories under excel-irr topic.
SunilVeeravalli/XIRR_in_Python
XIRR (using Python) to calculate return on investments done at different time periods which need not be periodic.
SunilVeeravalli/XIRR_in_R
XIRR (using R) to calculate return on investments done at different time periods which need not be periodic.