如何编写一个程序从xml文件里面提取一些关键的节点数据组成新的xml文件，最好是用python编写
如何编写一个程序从xml文件里面提取一些关键的节点数据组成新的xml文件，最好是用python编写的。
给你一段代码，供参考：
from sgmllib import SGMLParserimport htmlentitydefs
class BaseHTMLProcessor(SGMLParser):
def reset(self):
# extend (called by SGMLParser.__init__)
self.pieces = []
SGMLParser.reset(self)
def unknown_starttag(self, tag, attrs):
# called for each start tag
# attrs is a list of (attr, value) tuples
# e.g. for <pre class="screen">, tag="pre", attrs=[("class", "screen")]
# Ideally we would like to reconstruct original tag and attributes, but
# we may end up quoting attribute values that weren't quoted in the source
# document, or we may change the type of quotes around the attribute value
# (single to double quotes).
# Note that improperly embedded non-HTML code (like client-side Javascript)
# may be parsed incorrectly by the ancestor, causing runtime script errors.
# All non-HTML code must be enclosed in HTML comment tags (<!-- code -->)
# to ensure that it will pass through this parser unaltered (in handle_comment).
strattrs = "".join([' %s="%s"' % (key, value) for key, value in attrs])
self.pieces.append("<%(tag)s%(strattrs)s>" % locals())
def unknown_endtag(self, tag):
# called for each end tag, e.g. for </pre>, tag will be "pre"
# Reconstruct the original end tag.
self.pieces.append("</%(tag)s>" % locals())
def handle_charref(self, ref):
# called for each character reference, e.g. for " ", ref will be "160"
# Reconstruct the original character reference.
self.pieces.append("&#%(ref)s;" % locals())
def handle_entityref(self, ref):
# called for each entity reference, e.g. for "©", ref will be "copy"
# Reconstruct the original entity reference.
self.pieces.append("&%(ref)s" % locals())
# standard HTML entities are closed with a semicolon; other entities are not
if htmlentitydefs.entitydefs.has_key(ref):
self.pieces.append(";")
def handle_data(self, text):
# called for each block of plain text, i.e. outside of any tag and
# not containing any character or entity references
# Store the original text verbatim.
self.pieces.append(text)
def handle_comment(self, text):
# called for each HTML comment, e.g. <!-- insert Javascript code here -->
# Reconstruct the original comment.
# It is especially important that the source document enclose client-side
# code (like Javascript) within comments so it can pass through this
# processor undisturbed; see comments in unknown_starttag for details.
self.pieces.append("<!--%(text)s-->" % locals())
def handle_pi(self, text):
# called for each processing instruction, e.g. <?instruction>
# Reconstruct original processing instruction.
self.pieces.append("<?%(text)s>" % locals())
def handle_decl(self, text):
# called for the DOCTYPE, if present, e.g.
# <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
# "http://www.w3.org/TR/html4/loose.dtd">
# Reconstruct original DOCTYPE
self.pieces.append("<!%(text)s>" % locals())
def output(self):
"""Return processed HTML as a single string"""
return "".join(self.pieces)
if __name__ == "__main__":
for k, v in globals().items():
print k, "=", v追问
您好，上午上课去了，很感谢你。但是还是不太懂。请问你可以告诉我qq，我晚上回去再找你交流一下吗？麻烦了。
你好，请问要是我用ElementTree XML的借口编写，如何实现删除，修改，创建这些功能！
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