could not convert string to float (python)

Question

I am trying to find the sum of all numbers in a list but every time I try I get an error that it cannot convert the string to float. Here is what I have so far.

Answer 1

You need none of your code above. The while loop is unnecessary and it looks like its just exiting the loop in one iteration i.e. its not used correctly. If you're simply summing all the values in the list:

sum([float(i) for i in elec_used])

If this produces errors, please post your elec_used list. It probably contains string values or blank spaces.