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Почему это так:

 from collections import Iterable
import tensorflow as tf

v = tf.Variable(1.0)
print(isinstance(v, Iterable))

True
  

в то время как это

 iter(v)
  

дает

 TypeError: 'Variable' object is not iterable.
  

Я нашел метод ниже в классе переменных Tensorflow:

 def __iter__(self):
    """Dummy method to prevent iteration. Do not call.
    NOTE(mrry): If we register __getitem__ as an overloaded operator,
    Python will valiantly attempt to iterate over the variable's Tensor from 0
    to infinity.  Declaring this method prevents this unintended behavior.
    Raises:
      TypeError: when invoked.
    """
    raise TypeError("'Variable' object is not iterable.")
  

https://github.com/tensorflow/tensorflow/blob/master/tensorflow/python/ops/variables.py#L366