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[3.11] gh-71261: Add paragraph on shadowing submodules with star imports (GH-107004) #107099

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Jul 23, 2023
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[3.11] gh-71261: Add paragraph on shadowing submodules with star imports (GH-107004) #107099

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16 changes: 16 additions & 0 deletions Doc/tutorial/modules.rst
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Expand Up @@ -512,6 +512,22 @@ code::
This would mean that ``from sound.effects import *`` would import the three
named submodules of the :mod:`sound.effects` package.

Be aware that submodules might become shadowed by locally defined names. For
example, if you added a ``reverse`` function to the
:file:`sound/effects/__init__.py` file, the ``from sound.effects import *``
would only import the two submodules ``echo`` and ``surround``, but *not* the
``reverse`` submodule, because it is shadowed by the locally defined
``reverse`` function::

__all__ = [
"echo", # refers to the 'echo.py' file
"surround", # refers to the 'surround.py' file
"reverse", # !!! refers to the 'reverse' function now !!!
]

def reverse(msg: str): # <-- this name shadows the 'reverse.py' submodule
return msg[::-1] # in the case of a 'from sound.effects import *'

If ``__all__`` is not defined, the statement ``from sound.effects import *``
does *not* import all submodules from the package :mod:`sound.effects` into the
current namespace; it only ensures that the package :mod:`sound.effects` has
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