transform.py 文件源码-python代码片段

transform.py 文件源码
python
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def trace(self, prefix='', fileobj=None):
        """Print events as they pass through the transform.

        >>> html = HTML('<body>Some <em>test</em> text</body>', encoding='utf-8')
        >>> print(html | Transformer('em').trace())
        (None, ('START', (QName('body'), Attrs()), (None, 1, 0)))
        (None, ('TEXT', u'Some ', (None, 1, 6)))
        ('ENTER', ('START', (QName('em'), Attrs()), (None, 1, 11)))
        ('INSIDE', ('TEXT', u'test', (None, 1, 15)))
        ('EXIT', ('END', QName('em'), (None, 1, 19)))
        (None, ('TEXT', u' text', (None, 1, 24)))
        (None, ('END', QName('body'), (None, 1, 29)))
        <body>Some <em>test</em> text</body>

        :param prefix: a string to prefix each event with in the output
        :param fileobj: the writable file-like object to write to; defaults to
                        the standard output stream
        :rtype: `Transformer`
        """
        return self.apply(TraceTransformation(prefix, fileobj=fileobj))

    # Internal methods