Python 3.7.2 安装 lxml etree xml.etree.ElementTree

python --version
Python 3.7.2
 

pip install lxml==4.8.0
Collecting lxml==4.8.0
  Downloading lxml-4.8.0-cp37-cp37m-win_amd64.whl (3.6 MB)
     ---------------------------------------- 3.6/3.6 MB 3.5 MB/s eta 0:00:00
Installing collected packages: lxml
Successfully installed lxml-4.8.0

try:
  from lxml import etree
  print("running with lxml.etree")
except ImportError:
  try:
    # Python 2.5
    import xml.etree.cElementTree as etree
    print("running with cElementTree on Python 2.5+")
  except ImportError:
    try:
      # Python 2.5
      import xml.etree.ElementTree as etree
      print("running with ElementTree on Python 2.5+")
    except ImportError:
      try:
        # normal cElementTree install
        import cElementTree as etree
        print("running with cElementTree")
      except ImportError:
        try:
          # normal ElementTree install
          import elementtree.ElementTree as etree
          print("running with ElementTree")
        except ImportError:
          print("Failed to import ElementTree from any known place")

root = etree.Element("root")
print(root.tag)
root.append( etree.Element("child1") )
child2 = etree.SubElement(root, "child2")
print(child2.tag)

print(etree.tostring(root, pretty_print=True))