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Python 2. 7: 对象“ 元素树” 类型没有属性“ register_ namespace” 。
原标题:Python 2.7: type object "ElementTree" has no attribute "register_namespace"

使用 python 2.7.3( 或 2.7. 0) 代码, 我想更改属性“ 和机器人: versionCode= 2” 的值, 其名称为空间前缀“ 和机器人 ” :

#!/usr/bin/python
from xml.etree.ElementTree import ElementTree, dump
import sys, os

# Problem here:
ElementTree.register_namespace("android", "http://schemas.android.com/apk/res/android")

tree = ElementTree()
tree.parse("AndroidManifest.xml")
root = tree.getroot()
root.attrib["{http://schemas.android.com/apk/res/android}versionCode"] = "3"

dump(tree)

当不使用用“这里的问题”注释的代码线时,元素Tree是自动命名http://schemas.android.com/apk/res/android 至“ns0”(在“ns0:versionCode=3”中出现)。

因此,我使用ElementTree.register_namespace来绘制名为“android”的命名空间星际图,该星际图有文件记载,名称为“android”,“a href=” http://docs.python.org/library/xml.etree.elementtree.html#xml.etre.html#xml.etree.ElementTree.register_namespace”。

当我尝试这样做时,我得到的错误是:

AttributeError: type object  ElementTree  has no attribute  register_namespace 

有谁知道这个方法为什么不行吗?这个方法应该在python 2.7中提供。

最佳回答

register_namespace() is a function contained within the ElementTree module.
It is not contained within the ElementTree class...

暂且说:由于这样做有时会造成混乱,因此通常不建议对模块和类使用同一名称。 但我们现在不是要通过重新命名一个广泛使用的模块来打破生产代码吗?

您只需更改您的代码 :

#!/usr/bin/python
import xml.etree.ElementTree as ET # import entire module; use alias for clarity
import sys, os

# note that this is the *module* s `register_namespace()` function
ET.register_namespace("android", "http://schemas.android.com/apk/res/android")

tree = ET.ElementTree() # instantiate an object of *class* `ElementTree`
tree.parse("AndroidManifest.xml")
root = tree.getroot()
root.attrib["{http://schemas.android.com/apk/res/android}versionCode"] = "3"

ET.dump(tree) # we use the *module* s `dump()` function
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