(defun extract-src-content (name)
  (save-excursion
    (org-babel-goto-named-src-block name)
    (car (nthcdr 21 (cadr (org-element-at-point))))))

(org-element-property :value (org-element-at-point))

#+NAME: sine
#+BEGIN_SRC python
  import math

  x=math.sin(math.pi)
#+END_SRC

#+BEGIN_SRC python :noweb yes :results output :exports results
  text="""
  <<sine>>
  """
  print text
#+END_SRC

#+RESULTS:
:
: import math
:
: x=math.sin(math.pi)
:

#+BEGIN_SRC python :noweb yes :results output :exports results
 text="""
 <<sine>>
 """[:-1]
 print text
#+END_SRC