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Document the import semantics that if None is found in sys.modules for a module then ImportError is raised.

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Brett Cannon 2009-08-30 04:00:12 +00:00
parent 4d75fc1ce9
commit 757df6e4cd
2 changed files with 6 additions and 1 deletions
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4
Doc/reference/simple_stmts.rst
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@ -668,7 +668,9 @@ Once the name of the module is known (unless otherwise specified, the term
"module" will refer to both packages and modules), searching
for the module or package can begin. The first place checked is
:data:`sys.modules`, the cache of all modules that have been imported
previously. If the module is found there then it is used in step (2) of import.
previously. If the module is found there then it is used in step (2) of import
unless :keyword:`None` is found in :data:`sys.modules`, in which case
:exc:`ImportError` is raised.
.. index::
single: sys.meta_path

3
Misc/NEWS
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@ -174,6 +174,9 @@ Build
Documenation
------------
- Document that importing a module that has None in sys.modules triggers an
ImportError.
- Issue #6556: Fixed the Distutils configuration files location explanation
for Windows.