未检测到 Python 第二个循环

Question

I am using python and some arcpy modules (that I do not think are important for my question) to run a code containing three iterations (a loop with two smaller loops inside). My code looks like this:

file = r"C:Directory\File"
cursor = arcpy.SearchCursor(file,fields)
A = range(1,270)
os.chdir ('C:\Directory')
book = xlwt.Workbook()
sheet1 = book.add_sheet('Sheet1',cell_overwrite_ok = True)
for a in A:
tot = 0
result = 0
for row in cursor:
    if row.getValue('Firstfield') == a:
        tot = tot + row.getValue('secondfield')
        print (tot)
    for row in cursor:
        print row.getValue('GTYS_Branc')
        if row.getValue('GTYS_Branc') == a:
            result= result + row.getValue(Field1) * ((row.getValue(Field2))/tot )
    sheet1.write((branch-1),0,finalIIIprob)
    sheet1.write((a-1),1,result)
    book.save('Excel.xls')

The code works but does not give me the results I want. I noticed that the problem is that it practically ignores the second internal loop and every iteration of the first internal loop after the first one. What could the problem be?

Answer 1

问题可能是您正在迭代“数组”中的值，但那里只有一个数字 A，而不是从 0 到 A 的所有数字，您需要做的是使用范围函数：尝试我在范围（A）：