code: def del_tag(
              self,
              tag):
          
  
          if tag.replace("@", "") not in self.tags:
              return
  
          self.refresh
          oldContent = self.to_string(indentLevel=1)
          newTags = []
          newTags[:] = [n for n in newTags if tag not in n]
          self.tags = newTags
          newContent = self.to_string(indentLevel=1)
  
          # ADD DIRECTLY TO CONTENT IF THE PROJECT IS BEING ADDED SPECIFICALLY TO
          # THIS OBJECT
          self.parent._update_document_tree(
              oldContent=oldContent,
              newContent=newContent
          )
  
          self.refresh
          return None
docs: *delete a tag this taskpaper object*
  
          **Key Arguments:**
              - ``tag`` -- the tag to delete to the object
  
          **Usage:**
  
              .. code-block:: python 
  
                  aTask.del_tag("@due")