The OpenCC module currently lacks an explicit `__all__` definition in `__init__.py`.

[rintrint]

This can lead to ambiguity in what is intended to be exposed when using from opencc import *.

Adding __all__ = ["OpenCC"] will:

• Clearly define OpenCC as part of the public API.
• Avoid potential issues with unintended imports.
• Improve maintainability and clarify module structure.

This follows Python best practices for explicitly defining module exports.

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# Author: Yichen Huang (Eugene)
# GitHub: https://github.com/yichen0831/opencc-python
# January, 2016
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from .opencc import OpenCC

+ __all__ = ["OpenCC"]