Change all buses load P and Q injections

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Now I have 2 nested for loops, one goes though the rows and the other goes through the columns, my issue is with the change function: psspy.load_chng_6(Bus_Number,r"""Load_Number""",[_i,_i,_i,_i,_i,_i,_i],[P_inject, Q_inject,_f,_f,_f,_f,_f,_f],"") I need to be able to insert a new value each time

I have a CSV file for each variable (Bus_Number, Load_Number, P_inject, Q_inject). I need a command to allow me to input the next value into the load change function in each for loop iteration. Please help

If Load_Number is a variable there shouldn't be """ around it, i.e. psspy.load_chng_6(Bus_Number, Load_Number, [], [P_inject, Q_inject])

there must be """str""" in it, I get an error when I remove it. I need help know how to call the next item in the csv file I guess. But first, I need to convert my Load_Number csv list into a string rather than numbers

Load_number must be a string variable with id of the load. You must read the CSV-file and assign variables Bus_Number, Load_Number, P_inject and Q_inject before calling the API.