code: def sub():
      return ast.BinOp(
          left=Placeholder(0), op=ast.Pow(), right=ast.Constant(2, None)
      )
  
imports: from pythran.conversion import mangle
  from pythran.analyses import Check, Placeholder, AST_or
  from pythran.passmanager import Transformation
  from copy import deepcopy
  import gast
  from inspect import isclass
label_desc: Use image node_id 1 for calling the SqrPattern obj's underlying member method code with example usage: obj.sub() and returns: ast