[英]Writing with lxml emitting no whitespace even when pretty_print=True
我正在使用lxml
庫讀取xml模板,插入/更改一些元素,然后保存生成的xml。 我正在使用etree.Element
和etree.SubElement
方法etree.Element
創建的元素之一:
tree = etree.parse(r'xml_archive\templates\metadata_template_pts.xml')
root = tree.getroot()
stream = []
for element in root.iter():
if isinstance(element.tag, basestring):
stream.append(element.tag)
# Find "keywords" element and insert a new "theme" element
if element.tag == 'keywords' and 'theme' not in stream:
theme = etree.Element('theme')
themekt = etree.SubElement(theme, 'themekt').text = 'None'
for tk in themekeys:
themekey = etree.SubElement(theme, 'themekey').text = tk
element.insert(0, theme)
打印到屏幕上很好地print etree.tostring(theme, pretty_print=True)
:
<theme>
<themekt>None</themekt>
<themekey>Hydrogeology</themekey>
<themekey>Stratigraphy</themekey>
<themekey>Floridan aquifer system</themekey>
<themekey>Geology</themekey>
<themekey>Regional Groundwater Availability Study</themekey>
<themekey>USGS</themekey>
<themekey>United States Geological Survey</themekey>
<themekey>thickness</themekey>
<themekey>altitude</themekey>
<themekey>extent</themekey>
<themekey>regions</themekey>
<themekey>upper confining unit</themekey>
<themekey>FAS</themekey>
<themekey>base</themekey>
<themekey>geologic units</themekey>
<themekey>geology</themekey>
<themekey>extent</themekey>
<themekey>inlandWaters</themekey>
</theme>
但是,當使用etree.ElementTree(root).write(out_xml_file, method='xml', pretty_print=True)
寫出xml時,此元素在輸出文件中變平:
<theme><themekt>None</themekt><themekey>Hydrogeology</themekey><themekey>Stratigraphy</themekey><themekey>Floridan aquifer system</themekey><themekey>Geology</themekey><themekey>Regional Groundwater Availability Study</themekey><themekey>USGS</themekey><themekey>United States Geological Survey</themekey><themekey>thickness</themekey><themekey>altitude</themekey><themekey>extent</themekey><themekey>regions</themekey><themekey>upper confining unit</themekey><themekey>FAS</themekey><themekey>base</themekey><themekey>geologic units</themekey><themekey>geology</themekey><themekey>extent</themekey><themekey>inlandWaters</themekey></theme>
文件的其余部分寫得很好,但是此特定元素引起了(純粹是美觀的)麻煩。 關於我在做什么錯的任何想法?
以下是模板xml文件中的標記片段(將其另存為“ template.xml”,以便在底部使用代碼片段運行)。 僅當我解析現有文件並插入新元素時才進行標簽的拼合,而不是使用lxml
從頭開始創建xml時才進行。
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="fgdc_classic.xsl"?>
<metadata xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://water.usgs.gov/GIS/metadata/usgswrd/fgdc-std-001-1998.xsd">
<keywords>
<theme>
<themekt>ISO 19115 Topic Categories</themekt>
<themekey>environment</themekey>
<themekey>geoscientificInformation</themekey>
<themekey>inlandWaters</themekey>
</theme>
<place>
<placekt>None</placekt>
<placekey>Florida</placekey>
<placekey>Georgia</placekey>
<placekey>Alabama</placekey>
<placekey>South Carolina</placekey>
</place>
</keywords>
</metadata>
以下是要與標記代碼段一起使用的代碼段(以上):
# Create new theme element to insert into root
themekeys = ['Hydrogeology', 'Stratigraphy', 'inlandWaters']
tree = etree.parse(r'template.xml')
root = tree.getroot()
stream = []
for element in root.iter():
if isinstance(element.tag, basestring):
stream.append(element.tag)
# Edit theme keywords
if element.tag == 'keywords':
theme = etree.Element('theme')
themekt = etree.SubElement(theme, 'themekt').text = 'None'
for tk in themekeys:
themekey = etree.SubElement(theme, 'themekey').text = tk
element.insert(0, theme)
# Write XML to new file
out_xml_file = 'test.xml'
etree.ElementTree(root).write(out_xml_file, method='xml', pretty_print=True)
with open(out_xml_file, 'r') as f:
lines = f.readlines()
with open(out_xml_file, 'w') as f:
f.write('<?xml version="1.0" encoding="UTF-8"?>\n')
for line in lines:
f.write(line)
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