绕过ElementTree [英] Passing around an ElementTree

问题描述

在程序中，我需要在程序的各种功能中使用ElementTree对象.

In my program, I need to make use of an ElementTree object in various functions in my program.

更具体地说，我正在这样做:

More specifically, I am doing this:

tree = etree.parse('somefile.xml')

我正在程序中传递这棵树.

I am passing this tree around in my program.

我想知道这是否是一种好方法，或者我可以这样做:

I was wondering whether this is a good approach, or can I do this:

1. 创建全局树(我来自 C ++背景，我知道全局是 不好)
2. 根据需要再次创建树.

1. Create a global tree (I come from a C++ background and I know global is bad)
2. Create the tree again wherever required.

或者我的方法还可以吗?

Or is my approach ok?

推荐答案

在Python中(消除复杂性，为您的C ++背景打个比方)，所有对象都是通过引用传递的.而且由于树"是一个对象，因此您只传递了引用.现在，如果您有一组在同一棵树上操作的相关方法，则可能要考虑创建一个以该树对象作为成员的类.

In Python, (eliding complexities, making an analogy for your C++ background) all objects are passed by reference. And since "tree" is an object, you're only passing the reference. Now, if you have a group of related methods that operate on the same tree, you might want to consider creating a class with that tree object as a member.

此外，这是我上面提到的复杂性的快速参考: http://www .testingreflections.com/node/view/5126

Also, here's a quick reference to the complexities I glossed over above: http://www.testingreflections.com/node/view/5126

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