通過一個XML遍歷沒有在Python工作

Question

我的XML：

<animals> 
    <animal name="fox" fullname="fullfox"></animal> 
    <animal name="dog" fullname="halfdog"><food>milk</food><food>rice</food><food>meat</food> </animal> 
    <animal name="cow" fullname="doublecow"><food>grass</food></animal> 
    <animal name="blabla" fullname="fullbla"></animal> 
</animals> 

我試圖解析這個XML得到相同的XML作爲輸出。

doc = ET.parse("an.xml") 
root = doc.getroot() #Returns the root element for this tree. 
root_new = ET.Element("animals") 
for child in root: 
    name = child.attrib['name'] 
    fullname = child.attrib['fullname'] 

for g in root.findall("*/food"): 
    animal = ET.SubElement(root_new, "animal") 
    food  = ET.SubElement(animal, "food") 
    food.text = g.text 
    animal.set("name",name)    
    animal.set("fullname",fullname) 

tree = ET.ElementTree(root_new) 
tree.write(sys.stdout) 

，但我只得到了最後一個值

<animals> 
    <animal fullname="fullbla" name="blabla"><food>milk</food></animal> 
    <animal fullname="fullbla" name="blabla"><food>rice</food></animal> 
    <animal fullname="fullbla" name="blabla"><food>meat</food></animal> 
    <animal fullname="fullbla" name="blabla"><food>grass</food></animal> 
</animals> 

和食品節點也錯了，如何遍歷酷似我的輸入XML？

Answer 1

你的代碼看起來應該是這樣

doc = ET.parse("test.xml") 
root = doc.getroot() #Returns the root element for this tree. 
root_new = ET.Element("animals") 
for child in root: 
    name    = child.attrib['name'] 
    fullname   = child.attrib['fullname'] 
    animal = ET.SubElement(root_new, "animal") 
    animal.set("name",name)    
    animal.set("fullname",fullname) 

    for g in child.findall("food"): 
     food = ET.SubElement(animal, "food") 
     food.text = g.text 

tree = ET.ElementTree(root_new) 
tree.write(sys.stdout) 

Answer 2

有兩個問題。首先是你的縮進 - 我認爲這些是爲了嵌套循環。第二個問題是，你正在使用root.findall，這意味着你得到所有food項目，不管他們是在哪個節點試試這個：

... 
for child in root: 
    name = child.attrib['name'] 
    fullname = child.attrib['fullname'] 
    animal = ET.SubElement(root_new, 'animal') 
    for g in child.findall("food"): 
     food = ET.SubElement(animal, "food") 
     food.text = g.text 
     animal.set('name', name)    
     animal.set('fullname', fullname) 

Answer 3

你需要一個嵌套的循環：

for child in root: 
    name    = child.attrib['name'] 
    fullname   = child.attrib['fullname'] 
    # create "animal" here 
    animal = ET.SubElement(root_new, "animal") 
    animal.set("name",name)    
    animal.set("fullname",fullname) 
    for g in child.findall("food"): 
     # create "food" here 
     food  = ET.SubElement(animal, "food") 
     food.text = g.text