html.py 文件源码

def append(self, element):
        if isinstance(element, six.string_types):
            element = force_text(element)
            element = normalize_whitespace(element)
            if self.children:
                if isinstance(self.children[-1], six.string_types):
                    self.children[-1] += element
                    self.children[-1] = normalize_whitespace(self.children[-1])
                    return
        elif self.children:
            # removing last children if it is only whitespace
            # this can result in incorrect dom representations since
            # whitespace between inline tags like <span> is significant
            if isinstance(self.children[-1], six.string_types):
                if self.children[-1].isspace():
                    self.children.pop()
        if element:
            self.children.append(element)