int object is not iterable in python graph code example

Example 1: test if object is NoneType python

if variable is None:

Example 2: how to check if an object is iterable in python

try:
  obj = iter(obj)
  
 except:
  raise TypeError("obj is not iterable")
  
finally:
  print ("obj is iterable")
  
from collections import Iterable

if isinstance(obj, Iterable):
  print ("obj is iterable")
  
else:
  print ("obj is not iterable")