Python: TypeError: argument of type 'Comment' is not iterable

has_feels = 'feels' in comment

comment here looks to be an object with attributes which inherently is not iterable like a list or a string.

From the praw documentation, you need to access the comment's text via the body attribute:

So something like:

has_feels = 'feels' in comment.body

Here's some examples about why what you're current doing does not work:

>>> "x" in "xxyy"  # works (string is iterable)
>>> "x" in ["x", "y"]  # works (list is iterable)

>>> class MyClass(): pass
>>> c = MyClass()
>>> "y" in c
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: argument of type 'instance' is not iterable