ProjectStack

python

TypeError: 'NoneType' object is not iterable

You're trying to iterate (loop over) a value that is None. A function you expected to return a list or other iterable returned None instead.

Common causes

A function that was supposed to return a list returned None (missing return statement)
An in-place method like list.sort() or list.reverse() was used in a for loop
A query or lookup returned None when nothing was found instead of an empty list
Chaining operations on a None value: for item in get_items().filter()

How to fix it

Check the function that should return a list and verify it has a return statement
Use an empty list as a fallback: for item in (get_items() or []):
Separate the call from the iteration to inspect the value: items = get_items(); print(items)
If using in-place list methods, call them separately then iterate the original list

Example

Traceback (most recent call last):
  File "app.py", line 5, in <module>
    for item in get_results():
TypeError: 'NoneType' object is not iterable

Iterating the return value of get_results() which returns None instead of a list

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