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Assume Python 3.8 instead of 3.10 for target version #6397

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Aug 7, 2023
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Assume Python 3.8 instead of 3.10 for target version #6397

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e6faf57
Assume Python 3.8 instead of 3.10 for target version
zanieb Aug 7, 2023
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Add breaking changes entry
zanieb Aug 7, 2023
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8 changes: 8 additions & 0 deletions BREAKING_CHANGES.md
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# Breaking Changes

## 0.0.283

### The target Python version now defaults to 3.8 instead of 3.10 ([#6397](https://github.com/astral-sh/ruff/pull/6397))

Previously, when a target Python version was not specified, Ruff would use a default of Python 3.10. However, it is safer to default to an _older_ Python version to avoid assuming the availability of new features. We now default to the oldest supported Python version which is currently Python 3.8.

(We still support Python 3.7 but since [it has reached EOL](https://devguide.python.org/versions/#unsupported-versions) we've decided not to make it the default here.)

## 0.0.277

### `.ipynb_checkpoints`, `.pyenv`, `.pytest_cache`, and `.vscode` are now excluded by default ([#5513](https://github.com/astral-sh/ruff/pull/5513))
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4 changes: 2 additions & 2 deletions README.md
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# Allow unused variables when underscore-prefixed.
dummy-variable-rgx = "^(_+|(_+[a-zA-Z0-9_]*[a-zA-Z0-9]+?))$"

# Assume Python 3.10.
target-version = "py310"
# Assume Python 3.8
target-version = "py38"

[tool.ruff.mccabe]
# Unlike Flake8, default to a complexity level of 10.
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4 changes: 2 additions & 2 deletions docs/configuration.md
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# Allow unused variables when underscore-prefixed.
dummy-variable-rgx = "^(_+|(_+[a-zA-Z0-9_]*[a-zA-Z0-9]+?))$"

# Assume Python 3.10.
target-version = "py310"
# Assume Python 3.8
target-version = "py38"
```

As an example, the following would configure Ruff to: (1) enforce flake8-bugbear rules, in addition
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