## Overview

`reportUnnecessaryTypeIgnoreComment` is a Pylance diagnostic that warns when a `# type: ignore` or `# pyright: ignore` comment is present but not needed. This helps keep your codebase clean by identifying and removing unnecessary type ignore comments that no longer suppress any errors.

## Representative Issues

- [#2943](https://github.com/microsoft/pylance-release/issues/2943): Ensure that the use of `# type: ignore` comments is respected and correctly flagged by static analysis tools.
- [#3343](https://github.com/microsoft/pylance-release/issues/3343): Ensure that the `pyproject.toml` file is correctly configured to allow Pylance to perform accurate background analysis of the workspace.
- [#4163](https://github.com/microsoft/pylance-release/issues/4163): Ensure consistency in the use of type stubs between Pyright's CLI and Pylance settings, especially with `useLibraryCodeForTypes`.
- [#5200](https://github.com/microsoft/pylance-release/issues/5200): Provide a configuration setting to allow users to customize diagnostic rule severities based on the type checking mode, improving the granularity of error reporting.
- [#5887](https://github.com/microsoft/pylance-release/issues/5887): Ensure that classes inheriting from abstract base classes implement all abstract methods.
- [#6300](https://github.com/microsoft/pylance-release/issues/6300): When configuring file exclusions in a Python project, it's crucial to accurately exclude unnecessary folders like .venv to improve performance.
- [#2839](https://github.com/microsoft/pyright/issues/2839): Whenever possible, avoid using `# type: ignore` comments to maintain clean and accurate type annotations.
- [#3381](https://github.com/microsoft/pyright/issues/3381): Consider implementing specific error codes in Pyright that MyPy can understand and suppress, reducing manual intervention.

## Examples

**Error:**

```python
def add(a: int, b: int) -> int:
    return a + b  # type: ignore  # No error to suppress here
```

**Fix — remove the unnecessary comment:**

```python
def add(a: int, b: int) -> int:
    return a + b
```

If using `# pyright: ignore` with specific error codes:

```python
x: int = 1
y: int = x  # pyright: ignore[reportGeneralTypeIssues]  # No such error here
```

Remove the comment to keep the codebase clean.

## Common Fixes & Workarounds

1. Remove any `# type: ignore` or `# pyright: ignore` comments that are no longer needed.
2. Refactor code to resolve the underlying type error instead of suppressing it.
3. Use more specific error codes with ignore comments if you only want to suppress certain errors.
4. Refer to the [Pyright configuration documentation](https://github.com/microsoft/pyright/blob/main/docs/configuration.md#reportUnnecessaryTypeIgnoreComment) to adjust the severity or disable this diagnostic if needed.

## See Also

- [`python.analysis.diagnosticSeverityOverrides`](../settings/python_analysis_diagnosticSeverityOverrides.md) — adjust or suppress this diagnostic
- [`python.analysis.typeCheckingMode`](../settings/python_analysis_typeCheckingMode.md) — controls which diagnostics are enabled by default
