[codeXsidd]

Summary

Fixes TypeError: object of type 'NoneType' has no len() when decorating functions without default arguments using @_helpers.positional as a bare decorator.

Problem

In googleapiclient/_helpers.py, positional() automatically calculates the maximum positional arguments when used without arguments:

args, _, _, defaults, _, _, _ = inspect.getfullargspec(max_positional_args)
return positional(len(args) - len(defaults))(max_positional_args)

When a function does not define default arguments (e.g., def func(a, b): ... or def func(): ...), inspect.getfullargspec(...).defaults evaluates to None. Evaluating len(defaults) then crashes with:
TypeError: object of type 'NoneType' has no len()

Solution

Safely fallback to an empty tuple when defaults is None via len(defaults or ()). This correctly computes len(args) - 0 = len(args) positional arguments without raising a TypeError.

Testing

• Added tests in tests/test__helpers.py verifying @_helpers.positional on functions without default parameters and functions without arguments.
• Ran tests via pytest tests/test__helpers.py across default and POSITIONAL_EXCEPTION enforcement modes; all passed.

Related Issue

Closes #2845

[gemini-code-assist]

Code Review

This pull request fixes a potential TypeError in the positional_wrapper helper function when a decorated function has no default arguments, causing inspect.getfullargspec to return None for defaults. The calculation has been updated to use an empty tuple as a fallback, and corresponding unit tests have been added to verify this behavior. I have no feedback to provide.