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Fixed naive description of how relative imports work (spotted by Guido).

This commit is contained in:
Just van Rossum 2002-12-26 18:00:40 +00:00
parent 6d66240b0c
commit d208dc5175
1 changed files with 9 additions and 7 deletions
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pep-0302.txt
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@ -192,15 +192,17 @@ Specification part 1: The Importer Protocol
The built-in __import__ function (known as PyImport_ImportModuleEx The built-in __import__ function (known as PyImport_ImportModuleEx
in import.c) will then check to see whether the module doing the in import.c) will then check to see whether the module doing the
import is a package by looking for a __path__ variable in the import is a package or a submodule of a package. If it is indeed a
current global namespace. If it is indeed a package, it first tries (submodule of a) package, it first tries to do the import relative
to do the import relative to the package. For example if a package to the package (the parent package for a submodule). For example if
named "spam" does "import eggs", it will first look for a module a package named "spam" does "import eggs", it will first look for a
named "spam.eggs". If that fails, the import continues as an module named "spam.eggs". If that fails, the import continues as an
absolute import: it will look for a module named "eggs". Dotted absolute import: it will look for a module named "eggs". Dotted
name imports work pretty much the same: if package "spam" does name imports work pretty much the same: if package "spam" does
"import eggs.bacon", first "spam.eggs.bacon" is tried, and only if "import eggs.bacon" (and "spam.eggs" exists), "spam.eggs.bacon" is
that fails "eggs.bacon" is tried. tried and if that fails "eggs.bacon" is tried. (There are more
subtleties that are not described here, but these are not relevant
for implementers if the Importer Protocol.)
Deeper down in the mechanism, a dotted name import is split up by Deeper down in the mechanism, a dotted name import is split up by
its components. For "import spam.ham", first an "import spam" is its components. For "import spam.ham", first an "import spam" is