python elementtree-得到平均

Question

Using element tree in python, I want to get an average value.

Below is my data

Order A has a quantity of 12,10,and 5.. total is 27
Order B has a quantity of 9 and 40... total is 49
Order C has a quantity of 10,35, and 15.. total is 60  

When you total them then divide by 3, I should be getting 45.33. But on my code below, I'm getting 20. :( I'm extracting the above data from an XML file. Can you please help me identify the problem on my code. Thank you.

import xml.etree.ElementTree as ET
root = ET.ElementTree(file="nwind_medium.xml")

orders = root.findall("./orders")
for order in orders:
    orderdetails = order.findall("./orderdetails")
    total = 0
    for detail in orderdetails:
        quantity = detail.findall("./quantity")
        total += float(quantity[0].text)
numberOrders = len(orders)

print "The average number of itmes in order is", round((total / numberOrders),2)

Here's the whole XML file (updated) - - - Vins et alcools Chevalier VINET - - 72 Mozzarella di Giovanni 34.8 5 - 14 Formaggi Fortini srl - - 11 Queso Cabrales 14 12 - 5 Cooperativa de Quesos 'Las Cabras' - - 42 Singaporean Hokkien Fried Mee 9.8 10 - 20 Leka Trading - - Toms Spezialitaten TOMSP - - 14 Tofus 18.6 9 - 6 Mayumi's - - 51 Manjimup Dried Apples 42.4 40 - 24 G'day, Mate - - Hanari Carnes HANAR - - 65 Louisiana Fiery Hot Pepper Sauce 16.8 15 - 2 New Orleans Cajun Delights - - 41 Jack's New England Clam Chowder 7.7 10 - 19 New England Seafood Cannery - - 51 Manjimup Dried Apples 42.4 35 - 24 G'day, Mate

Answer 1

You are resetting total on each iteration through an order. If you need total of all orders move

total = 0

before the outer loop.