code: def python_implementation():
      """Returns a string identifying the Python implementation.
  
      Currently, the following implementations are identified:
        'CPython' (C implementation of Python),
        'IronPython' (.NET implementation of Python),
        'Jython' (Java implementation of Python),
        'PyPy' (Python implementation of Python).
  
      """
      return _sys_version()[0]
  
imports: import collections
  import os
  import re
  import sys
  import functools
  import itertools
label_desc: Use image node_id 28 for calling a global function with example usage: python_implementation() and returns: _sys_version