python - __init__.py 是干什么用的？

Question

什么是__init__.py在 Python 源目录中？

Answer 1

它曾经是包的必需部分( old, pre-3.3 "regular package" ，而不是 newer 3.3+ "namespace package" )。

Here's the documentation.

Python defines two types of packages, regular packages and namespace packages. Regular packages are traditional packages as they existed in Python 3.2 and earlier. A regular package is typically implemented as a directory containing an __init__.py file. When a regular package is imported, this __init__.py file is implicitly executed, and the objects it defines are bound to names in the package’s namespace. The __init__.py file can contain the same Python code that any other module can contain, and Python will add some additional attributes to the module when it is imported.

但是只需点击链接，它包含一个示例，更多信息，以及命名空间包的解释，没有__init__.py的那种包。