code: def _import_cffi():
      global ffi, CData
  
      if ffi is not None:
          return
  
      try:
          import cffi
  
          ffi = cffi.FFI()
          CData = ffi.CData
      except ImportError:
          ffi = False
  
file_path: catboost/contrib/python/scipy/py2/scipy/_lib/_ccallback.py
imports: from .None import _ccallback_c
  import ctypes
label_desc: Use image node_id 1 for calling a global function with example usage: _import_cffi() without return types