TypeError: 'type' object is not subscriptable

[MinkiChung]

def merge_and_swap(list1, list2):
  list1=list1+list2
 
  list1.insert(0,list[-1])
  list1.pop(4)
 
  list1.insert(1,list[4])
  list1.pop(1)
 
  return list1
 
print(merge_and_swap([1,2,3], [5]))
 

I took a Error line which is 'TypeError: 'type' object is not subscriptable. What's the matter on my code and how can I solve it? Please give me an answer.

[Rabbit]

You reference a non-existent list, you probably meant list2

[Sage11]

The issue is you typed

list[-1]

. list is a type. I think you mean

list1[-1]

[bennetcole]

The error is self-explanatory. You are trying to subscript an object which you think is a list or dict, but actually is None. This means that you tried to do:

None[something]

NoneType is the type of the None object which represents a lack of value, for example, a function that does not explicitly return a value will return None . You might have noticed that the method sort() that only modify the list have no return value printed – they return the default None. This is a design principle for all mutable data structures in Python. 'NoneType' object is not subscriptable is the one thrown by python when you use the square bracket notation object[key] where an object doesn't define the __getitem__ method . This is a design principle for all mutable data structures in Python.