class_docstr: Leafs are basically tokens with a better API. Leafs exactly know where they
  were defined and what text preceeds them.
code: def start_pos(self):
      return self.line, self.column
  
imports: import sys
  from abc import abstractmethod, abstractproperty
  from parso._compatibility import utf8_repr, encoding
  from parso.utils import split_lines
label_desc: Use image node_id 2 for calling the Leaf obj's underlying member method code with example usage: obj.start_pos() and returns: self,  self