The line causing the error is
totalR = totalR + (float(string.replace(contri[0][5],",","")) + float(string.replace(contri[0][6],",","")))
contri[0][5] and [6] are strings that contain numbers formatted as 1,000.00. I'm removing the commas before I cast the strings as floats in order to add them to totalR, which is a float. (Created as totalR = 0.0) I also tried using Decimal, but the error happened there too. I did "import string". The program fails with error:
File "mine.py", line 43, in fillDonorData
totalR = totalR + (float(string.replace(contri[0][5],",","")) + float(string.replace(contri[0][6],",","")))
AttributeError: 'module' object has no attribute 'replace'