Package lxml :: Module builder :: Class ElementMaker
[show private | hide private]
[frames | no frames]

Type ElementMaker

object --+

Element generator factory.

Unlike the ordinary Element factory, the E factory allows you to pass in more than just a tag and some optional attributes; you can also pass in text and other elements. The text is added as either text or tail attributes, and elements are inserted at the right spot. Some small examples:
   >>> from lxml import etree as ET
   >>> from lxml.builder import E

   >>> ET.tostring(E("tag"))
   >>> ET.tostring(E("tag", "text"))
   >>> ET.tostring(E("tag", "text", key="value"))
   '<tag key="value">text</tag>'
   >>> ET.tostring(E("tag", E("subtag", "text"), "tail"))
For simple tags, the factory also allows you to write ``E.tag(...)`` instead of ``E('tag', ...)``:
   >>> ET.tostring(E.tag())
   >>> ET.tostring(E.tag("text"))
   >>> ET.tostring(E.tag(E.subtag("text"), "tail"))
Here's a somewhat larger example; this shows how to generate HTML documents, using a mix of prepared factory functions for inline elements, nested ``E.tag`` calls, and embedded XHTML fragments:
   # some common inline elements
   A = E.a
   I = E.i
   B = E.b

   def CLASS(v):
       # helper function, 'class' is a reserved word
       return {'class': v}

   page = (
               E.title("This is a sample document")
               E.h1("Hello!", CLASS("title")),
               E.p("This is a paragraph with ", B("bold"), " text in it!"),
               E.p("This is another paragraph, with a ",
                   A("link", href=""), "."),
               E.p("Here are some reservered characters: <spam&egg>."),
               ET.XML("<p>And finally, here is an embedded XHTML fragment.</p>"),

   print ET.tostring(page)
Here's a prettyprinted version of the output from the above script:
       <title>This is a sample document</title>
       <h1 class="title">Hello!</h1>
       <p>This is a paragraph with <b>bold</b> text in it!</p>
       <p>This is another paragraph, with <a href="">link</a>.</p>
       <p>Here are some reservered characters: &lt;spam&amp;egg&gt;.</p>
       <p>And finally, here is an embedded XHTML fragment.</p>

Method Summary
  __init__(self, typemap, makeelement)
  __call__(self, tag, *children, **attrib)
  __getattr__(self, tag)
    Inherited from object
x.__delattr__('name') <==> del
x.__getattribute__('name') <==>
x.__hash__() <==> hash(x)
  __new__(T, S, ...)
T.__new__(S, ...) -> a new object with type S, a subtype of T
helper for pickle
helper for pickle
x.__repr__() <==> repr(x)
x.__setattr__('name', value) <==> = value
x.__str__() <==> str(x)

Generated by Epydoc 2.1 on Thu Jul 26 19:14:08 2007