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Python程序设计单选题中等

以下哪个是Python中用于定义包内模块可见性的关键文件?

0{ "key": "A", "text": "setup.py" }
1{ "key": "B", "text": "requirements.txt" }
2{ "key": "C", "text": "__init__.py" }
3{ "key": "D", "text": "README.md" }