Python XML 文件打开 [英] Python XML File Open

问题描述

我正在尝试打开一个 xml 文件并解析它，但是当我尝试打开它时，该文件似乎根本没有打开它只是一直在运行，有什么想法吗?

I am trying to open an xml file and parse it, but when I try to open it the file never seems to open at all it just keeps running, any ideas?

from xml.dom import minidom
Test_file = open('C::/test_file.xml','r')
xmldoc = minidom.parse(Test_file)

Test_file.close()

for i in xmldoc:
     print('test')

文件是 180.288 KB，为什么它从来没有进入打印部分?

The file is 180.288 KB, why does it never make it to the print portion?

推荐答案

通过一些调整运行 Python 代码:

from xml.dom import minidom
Test_file = open('C:/test_file.xml','r')
xmldoc = minidom.parse(Test_file)

Test_file.close()

def printNode(node):
  print node
  for child in node.childNodes:
       printNode(child)

printNode(xmldoc.documentElement)

将此示例输入作为 test_file.xml:

<a>
  <b>testing 1</b>
  <c>testing 2</c>
</a>

产生此输出:

<DOM Element: a at 0xbc56e8>
<DOM Text node "u'\n  '">
<DOM Element: b at 0xbc5788>
<DOM Text node "u'testing 1'">
<DOM Text node "u'\n  '">
<DOM Element: c at 0xbc5828>
<DOM Text node "u'testing 2'">
<DOM Text node "u'\n'">

注意事项:

• 正如@LukeWoodward 所提到的，避免对大型输入使用基于 DOM 的库，但是 180K 应该没问题.对于 180M，控制可能永远不会从 minidom.parse() 返回，而不会先耗尽内存(MemoryError).
• 正如@alecxe 所提到的，您应该消除文件规范中多余的:".您应该已经看到了 IOError: [Errno 22] invalid mode ('r') 或 filename: 'C::/test_file.xml' 的错误输出.
• 正如@mzjn 提到的，xml.dom.minidom.Document 是不可迭代的.您应该已经看到了 TypeError:iteration over non-sequence 的错误输出.

• As @LukeWoodward mentioned, avoid DOM-based libraries for large inputs, however 180K should be fine. For 180M, control may never return from minidom.parse() without running out of memory first (MemoryError).
• As @alecxe mentioned, you should eliminate the extraneous ':' in the file spec. You should have seen error output along the lines of IOError: [Errno 22] invalid mode ('r') or filename: 'C::/test_file.xml'.
• As @mzjn mentioned, xml.dom.minidom.Document is not iterable. You should have seen error output along the lines of TypeError: iteration over non-sequence.

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