Need help creating complex loop around existing script

[CephloRhod]

I agree it is confusing! I have renamed the df "master_df" as advised.

I have tried to implement the for loop suggested above on my script, but am not entirely sure where to intergrate it in, and as a result keep getting the classic "invalid syntax" error when I try run the script. Where in my script above would you intergrate this for loop in?

Sorry for being so useless :S