As the error message suggests, the problem might be near line 40.
Look at lines 40 and 41 in your program.
print(rates[row[0]] + " / VALUE : " + str(value))
rates[row[0]] = value
Look at it very carefully, and try to explain to yourself what those
two lines mean.
What do you _want_ to happen when those two statements execute?
What does "row[0]" mean?
What does "rates[row[0]]" mean?
Do you notice something strange?
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