Why does "TypeError: 'bool' object is not iterable" occur?

>>> l1 = [1,2,3]
>>> l2 = [1,2]
>>> assert all(any(x in l1 for x in l2))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'bool' object is not iterable

I want to check whether l2 is included in l1.

>Solution :

Just call all(), not any().

assert(all(x in l1 for x in l2))

You can also use set operations:

assert(set(l2) <= set(l1))