code: def is_factor(obj):
      """Is obj a Factor?"""
      return hasattr(obj, "_factor_flag")
  
imports: import itertools
  import warnings
  from string import ascii_letters, digits
  import numpy
  import sympy
  from scipy.linalg import pinv
  from sympy import Dummy, default_sort_key
  from sympy.utilities.lambdify import implemented_function, lambdify
  from nipy.algorithms.utils.matrices import full_rank, matrix_rank
  from nipy.utils import VisibleDeprecationWarning, _NoValue
label_desc: Use image node_id 14 for calling a global function with example usage: is_factor(obj) and returns: hasattr