TypeError: Object is Not Subscriptable
TypeError: 'NoneType' object is not subscriptableQuick Answer
You are trying to use square bracket indexing on an object that does not support it, such as None or an integer. This usually means a function returned None when you expected a list or dict.
Why This Happens
Subscripting with [] only works on sequences (list, tuple, str) and mappings (dict). If you try to index into None or an int, Python raises this error. The most common cause is calling a method that returns None then indexing the result.
The Problem
data = [3, 1, 2]
result = data.sort()
first = result[0]The Fix
data = [3, 1, 2]
data.sort()
first = data[0]
# Or use sorted():
result = sorted(data)
first = result[0]Step-by-Step Fix
- 1
Check the variable's value
Add a print statement before the failing line to see what the variable holds.
- 2
Trace back to the assignment
Find where the variable was assigned. If it comes from a method that returns None, use the original object.
- 3
Add a None check
Add: if result is not None: first = result[0].
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