Typeerror: ‘nonetype’ object is not subscriptable

In Python, running into errors like typeerror: ‘nonetype’ object is not subscriptable is unavoidable.

Knowing that errors are unavoidable, we should also be mindful that understanding them is the first step to fixing them.

In this article, we will provide you with information about this error.

Understand the error mentioned above before proceeding to the tutorial on how to fix it.

What is typeerror: ‘nonetype’ object is not subscriptable?

The typeerror: ‘nonetype’ object is not subscriptable is an error message that occurs in Python.

Attempting to use the operation “indexing” or “slicing” on a NoneType object is what triggers this error.

What is a NoneType object?

In Python, a NoneType object is a unique data type.

The absence of a value is what it represents.

When a function or method does not specifically give a value back, it is returned.

Most importantly, it does not support indexing and slicing operations.

Back to the issue, here is a sample code that triggers the error:

my_list = None
print(my_list[0])

Error:

Traceback (most recent call last):
  File "C:\Users\path\PyProjects\sProject\main.py", line 2, in <module>
    print(s_list[0])
          ~~~~~~^^^
TypeError: 'NoneType' object is not subscriptable

Typeerror: ‘nonetype’ object is not subscriptable – SOLUTION

Here is a sample code that solves the code above that triggers this error:

s_list = [1, 2, 3, 4, 5, 6, 7, 8, 9]
print(s_list[0])

Output:

1

Tips to avoid getting type errors

The following are some tips to avoid getting type errors in Python.

• Avoid using the built-in data types in Python in the wrong way.
• Always check or confirm the types of your variables.
• Be clear and concise when writing code.
• Handle the error by using try-except blocks.
• Use the built-in functions of Python if needed.

FAQs (Frequently Asked Questions)

Conclusion

In conclusion, the typeerror: ‘nonetype’ object is not subscriptable is an unavoidable error that occurs in Python.

You can solve this error by making sure that you are not indexing or slicing a NoneType object.

By following the guide above, you will surely solve this error quickly.

That is all for this tutorial, IT source coders!

We hope you have learned a lot from this. Have fun coding!

Thank you for reading! 😊

Why NoneType TypeErrors happen so often

Python returns None from many functions when there is nothing meaningful to return: from methods that mutate in place (list.append, dict.update), from lookups that miss (dict.get with no default), and from any function that ends without an explicit return. When you use that None as if it were the expected value, you get a TypeError.

Common triggers of NoneType TypeError

• Method chaining on mutating operations. sorted(list) returns a new sorted list, but list.sort() sorts in place and returns None. Never write x = my_list.sort().
• Print statements accidentally assigned. x = print(value) assigns None, not value.
• Missing return in a function. A function that only has if branches without returns falls through to an implicit return None.
• Dictionary lookups with missing key. value = my_dict.get(key) returns None if key is missing. Provide a default: my_dict.get(key, default_value).
• Regex match returning None. re.search returns None if no match. Guard with an if before .group().

Working diagnostic pattern

# BAD — silent None propagation
def get_config(env):
    if env == "prod":
        return {"db": "prod-cluster"}
    # No else — implicit return None

config = get_config("staging")
print(config["db"])  # TypeError: 'NoneType' object is not subscriptable

# GOOD — explicit branch handling
def get_config(env):
    if env == "prod":
        return {"db": "prod-cluster"}
    if env == "staging":
        return {"db": "staging-cluster"}
    raise ValueError(f"Unknown env: {env}")

Best practices

• Use type hints (Python 3.6+). Type-checkers like mypy or Pyright catch these before runtime.
• Prefer Optional[T] when a function may return None. Callers must handle the None case.
• Fail fast at boundaries. Raise an explicit exception in helper functions rather than returning None silently.

Elijah Galero

Programmer & Technical Writer at PIES IT Solution

Elijah Galero is a programmer and writer at PIES IT Solution, author of 175+ tutorials at itsourcecode.com. Specializes in Python error debugging (AttributeError, TypeError, ModuleNotFoundError), Python programming tutorials, and Microsoft Excel how-to guides for BSIT students and productivity learners.

Expertise: Python · Python Errors · Python AttributeError · Python TypeError · ModuleNotFoundError · MS Excel · MS PowerPoint
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