Python - for循环仅输出最后一次迭代

Question

我正在尝试创建一个应用程序来创建 xml 文件，并且我想将文本分配给某些元素。此文本包含文件夹中的图像文件。代码如下:

    import glob
    import os
    import os.path

    from xml.etree import ElementTree
    from xml.dom import minidom
    import xml.etree.ElementTree as ET

    def prettify(elem):
    """Return a pretty-printed XML string for the Element.
    """
        rough_string = ElementTree.tostring(elem, 'utf-8')
        reparsed = minidom.parseString(rough_string)
        return reparsed.toprettyxml(indent="  ")

    path = "/home/unkuiri/Ubuntu One/Wallpapers/*"


    background = ET.Element('background')
    starttime = ET.SubElement(background, 'starttime')
    year = ET.SubElement(starttime, 'year')
    month = ET.SubElement(starttime, 'month')
    day = ET.SubElement(starttime, 'day')
    hour = ET.SubElement(starttime, 'hour')
    minute = ET.SubElement(starttime, 'minute')
    second = ET.SubElement(starttime, 'second')
    static = ET.SubElement(background, 'static')
    duration_stat = ET.SubElement(static, 'duration')
    files = ET.SubElement(static, 'file')
    transition = ET.SubElement(background, 'transition')
    duration_trans = ET.SubElement(transition, 'duration')
    from1 = ET.SubElement(transition, 'from')
    to = ET.SubElement(transition, 'to')

    dirList = glob.glob(path)

    while len(background.findall("./static/file")) <= len([name for name in os.listdir('.') if os.path.isfile(name)]):
            background.append(static)
            background.append(transition)
            continue

    for fname in dirList:   

        to.text = fname
        files.text = fname
        from1.text = fname


    print prettify(background)

此代码输出格式正确的 xml，但仅包含最后一个路径，重复次数与文件夹中文件的数量相同。我想要的是它为每个"file"元素打印一个路径，并在前面的“到”元素​​和下一个“元素”上打印相同的路径。也许这是一个我不知道的简单解决方案。我还是个新手。

提前致谢

Answer 1

您只需创建一个元素并多次添加同一个元素。

在 for 循环中，您会一遍又一遍地分配该元素的成员，因此最终只会得到最后一个 fname

您需要创建一个新元素并每次在 for 循环中填充它

也许你应该有更多类似这样的东西

background = ET.Element('background')
dirList = glob.glob(path)

for fname in dirList:   

    starttime = ET.SubElement(background, 'starttime')
    year = ET.SubElement(starttime, 'year')
    month = ET.SubElement(starttime, 'month')
    day = ET.SubElement(starttime, 'day')
    hour = ET.SubElement(starttime, 'hour')
    minute = ET.SubElement(starttime, 'minute')
    second = ET.SubElement(starttime, 'second')
    static = ET.SubElement(background, 'static')
    duration_stat = ET.SubElement(static, 'duration')
    files = ET.SubElement(static, 'file')
    transition = ET.SubElement(background, 'transition')
    duration_trans = ET.SubElement(transition, 'duration')
    from1 = ET.SubElement(transition, 'from')
    to = ET.SubElement(transition, 'to')

    to.text = fname
    files.text = fname
    from1.text = fname