Python4 min read2026-03-01

Python TypeError: object is not subscriptable

Fix 'TypeError: 'NoneType' object is not subscriptable' and argument type errors in Python.

Error Code / Stack Trace

TypeError: 'NoneType' object is not subscriptable

The program uses indexing or key access (obj[0] or obj['key']) on an object that does not support indexing, most commonly None.

A function that returns None by default (e.g. missing return statement) was assigned to a variable.
A database query returned None because no matching record was found.

Add an explicit check before accessing indices.

python

result = find_user(42)
if result is not None:
    print(result['username'])
else:
    print('User not found')

•Calling list.sort() and expecting it to return a new list. list.sort() sorts in-place and returns None!

list.append() modifies the list in-place and returns None. If you do x = my_list.append(1), x will be None.