Utilityrate5.ElectricityRates.ur_ec_tou_mat a touple, does not support item assi

Hi Paul,
It is time to go home here, but I thought I'd send you a query, since you are six or more hours ahead of me, and if I wait until tomorrow, it will delay an answer another day. 
I'm trying to change the utility rate, and finding it immutable.  Maybe I need to use the assign method.  Here is what I'm doing: ur.ElectricityRates.ur_ec_tou_mat[0][4] = rate_sheet.cell_value(i, 1)
I get the following error: Any ideas?
And thanks!
Rob

Hi Rob,

To assign values as they appear in this screenshot of the energy charge input table in the SAM user interface,



the 'ur_ec_tou_mat' array would be defined as (with line breaks and spacing to make it more legible):

To assign the buy rate for Period 1, Tier 1 to $0.10/kWh, you would set:

So, that part of your assignment looks correct.

From the PySAM 2.0 documentation for the Utilityrate5 module, it looks like 'ur_ec_tou_mat' is a sequence: nrel-pysam.readthedocs.io/en/2.0.2/modules/Utilityrate5.html#module-PySAM.Utilityrate5 .

The error message suggests that `ur.ElectricityRates.ur_ec_tou_mat` is a tuple. Tuples, unlike lists, are immutable in Python, so they can't be changed.

Is that enough information to solve the problem?

Thanks,
Paul.

Thanks Paul,
You and I agree on everything here.  You have nicely summarized things.  Python does indeed think the type is tuple, and certainly tuples are not mutable.  This is unfortunate, because I need to modify the electric rates to make my rates change over time.  I think I have all the code do do that put together now, but I was assuming that the rates were mutable.  I'm not really a python programmer (yet), and I'm still stuck.  There must be a way around this.  Any other ideas? 
Thanks,
Rob

Hi Paul,
I found my answer.   You convert the tuple to a list, and then make a new tuple with the values of the list. It seems to work. Thanks,
Rob