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-rw-r--r--Doc/reference/import.rst6
1 files changed, 5 insertions, 1 deletions
diff --git a/Doc/reference/import.rst b/Doc/reference/import.rst
index 9c52435..b587fc9 100644
--- a/Doc/reference/import.rst
+++ b/Doc/reference/import.rst
@@ -353,7 +353,11 @@ Loaders must satisfy the following requirements:
* The loader may set the ``__file__`` attribute of the module. If set, this
attribute's value must be a string. The loader may opt to leave
``__file__`` unset if it has no semantic meaning (e.g. a module loaded from
- a database).
+ a database). If ``__file__`` is set, it may also be appropriate to set the
+ ``__cached__`` attribute which is the path to any compiled version of the
+ code (e.g. byte-compiled file). The file does not need to exist to set this
+ attribute; the path can simply point to whether the compiled file would
+ exist (see :pep:`3147`).
* The loader may set the ``__name__`` attribute of the module. While not
required, setting this attribute is highly recommended so that the