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SF patch #1438387, PEP 328: relative and absolute imports.

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- IMPORT_NAME takes an extra argument from the stack: the relativeness of
   the import. Only passed to __import__ when it's not -1.

 - __import__() takes an optional 5th argument for the same thing; it
   __defaults to -1 (old semantics: try relative, then absolute)

 - 'from . import name' imports name (be it module or regular attribute)
   from the current module's *package*. Likewise, 'from .module import name'
   will import name from a sibling to the current module.

 - Importing from outside a package is not allowed; 'from . import sys' in a
   toplevel module will not work, nor will 'from .. import sys' in a
   (single-level) package.

 - 'from __future__ import absolute_import' will turn on the new semantics
   for import and from-import: imports will be absolute, except for
   from-import with dots.

Includes tests for regular imports and importhooks, parser changes and a
NEWS item, but no compiler-package changes or documentation changes.
This commit is contained in:
Thomas Wouters 2006-02-28 16:09:29 +00:00
parent d3188639c3
commit f7f438ba3b
20 changed files with 270 additions and 73 deletions
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@ -59,7 +59,7 @@ yield_stmt: yield_expr
raise_stmt: 'raise' [test [',' test [',' test]]]
import_stmt: import_name | import_from
import_name: 'import' dotted_as_names
import_from: ('from' ('.')* dotted_name
import_from: ('from' ('.'* dotted_name | '.')
'import' ('*' | '(' import_as_names ')' | import_as_names))
import_as_name: NAME [NAME NAME]
dotted_as_name: dotted_name [NAME NAME]