Python 3.3：将XML转换为YAML

Question

我正在尝试使用Python3.3将XML文件转换为YAML。 这是我的代码：

#! /etc/python3

test_filename_input = './reference-conversions/wikipedia-example.xml'
test_filename_output = 'wikipedia-example_xml_read-as-binary.yaml'

file_object = open( test_filename_input, 'rb')
data_in = file_object.read()
file_object.close()

from xml.dom.minidom import parseString
document_object = parseString( data_in)

import yaml
stream = open( test_filename_output, 'w')
yaml.dump( document_object, stream)
stream.close()

作为引用，我使用了来自here的XML文件：

<person>
  <firstName>John</firstName>
  <lastName>Smith</lastName>
  <age>25</age>
  <address>
    <streetAddress>21 2nd Street</streetAddress>
    <city>New York</city>
    <state>NY</state>
    <postalCode>10021</postalCode>
  </address>
  <phoneNumbers>
    <phoneNumber type="home">212 555-1234</phoneNumber>
    <phoneNumber type="fax">646 555-4567</phoneNumber>
  </phoneNumbers>
  <gender>
    <type>male</type>
  </gender>
</person>

结果应该是这样的：

---
  firstName: John
  lastName: Smith
  age: 25
  address: 
        streetAddress: 21 2nd Street
        city: New York
        state: NY
        postalCode: 10021

  phoneNumber: 
        -  
            type: home
            number: 212 555-1234
        -  
            type: fax
            number: 646 555-4567
  gender: 
        type: male

然而，结果是：

&id001 !!python/object/new:xml.dom.minidom.Document
state: !!python/tuple
- implementation: !!python/object:xml.dom.minidom.DOMImplementation {}
- _elem_info: {}
  _id_cache: {}
  _id_search_stack: null
  childNodes: !!python/object/new:xml.dom.minicompat.NodeList
    listitems:
    - &id039 !!python/object/new:xml.dom.minidom.Element
      state: !!python/tuple
      - null
      - _attrs: null
        _attrsNS: null
        childNodes: !!python/object/new:xml.dom.minicompat.NodeList
          listitems:
          - &id045 !!python/object/new:xml.dom.minidom.Text
            state: !!python/tuple
            - null
            - _data: "\n  "
              nextSibling: &id002 !!python/object/new:xml.dom.minidom.Element
                state: !!python/tuple
                - null
                - _attrs: null
                  _attrsNS: null
                  childNodes: !!python/object/new:xml.dom.minicompat.NodeList
                    listitems:
[...]

好的，如何让PyYAML从xml.dom.minidom中过滤出对象内容，或者使用xml.dom.minidom的任何替代方法？

谢谢！

Answer 1

我发现了一个XML to YAML converter，但我不得不在第92行做了一个小改动：

outStr = yaml.dump(out)

更改为

outStr = yaml.safe_dump(out)

它删除输出中的任何!!python/unicode标记。我已经通过shell命令行测试了这个脚本，它工作得很好；我确信这只是一个简单的转换，可以让它在Python命令行中工作。

编辑

我还添加了自己的打印方法，使输出更像您最初发布的内容：

def prettyPrint(node, level):
childPrint = 0
attrPrint = 0

for x in node:
    try:
        if x['attributes']:
            attrPrint = 1

            for l in range(0, level):
                sys.stdout.write("\t")

            for a in x['attributes']:
                sys.stdout.write("- %s: %s\n" % (a, x['attributes'][a]))

    except KeyError:
        try:
            if x['children']:
                childPrint = 1

                for l in range(0, level):
                    sys.stdout.write("\t")

                sys.stdout.write("%s:\n" % x['name'])
                prettyPrint(x['children'], level+1)

        except KeyError:
            pass

    finally:
        if not childPrint:
            printNextNode(x, level, attrPrint)
            attrPrint = 0

        else:
            childPrint = 0

def printNextNode(node, level, attrPrint):
    for l in range(0, level):
        sys.stdout.write("\t")

    if attrPrint:
        sys.stdout.write('  ')

    sys.stdout.write("%s: %s\n" % (node['name'], node['text']))

然后在convertXml2Yaml函数中调用：

sys.stdout.write('%s:\n' % out['name'])
prettyPrint(out['children'], 1)