human
Solve the following python programming problem given the following code:
def _test_extension_element_attribute_context(self) : 
    tree = self.parse ('<a test="A"><b attr="B"/></a>') 
    style = self.parse ('<xsl:stylesheet version="1.0"
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:myns="testns"
    extension-element-prefixes="myns"
    exclude-result-prefixes="myns">
  <xsl:template match="@test">
    <A><myns:myext>b</myns:myext></A>
  </xsl:template>
  <xsl:template match="@attr">
    <A><myns:myext>b</myns:myext></A>
  </xsl:template>
</xsl:stylesheet>') 
    text = [] 
    class MyExt (etree.XSLTExtension) : 
        def execute(self, context, self_node, attr_value, output_parent) : 
            text.append (attr_value) 
extensions = { 
        ('testns', 'myext') : MyExt (), 
} 
    result = tree.xslt (result, extensions = extensions) 
    self.assertEqual (text, ['A', 'B']) 

    
    

    Fix the buggy line: result = tree.xslt (result, extensions = extensions)
assistant
#Here is Python code to fix the buggy line: result = tree.

result = tree.xslt (style, extensions = extensions)