code: def __call__(self, *args, **kwargs):
      f = next(self.funcs)
      return f(*args, **kwargs)
  
file_path: scikit-image/skimage/segmentation/morphsnakes.py
imports: from itertools import cycle
  import numpy
  from scipy import ndimage
  from .._shared.utils import check_nD
label_desc: Use image node_id 2 for calling the _fcycle obj's underlying member method code with example usage: obj.__call__() and returns: f