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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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27
Python/compile.c
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@ -2452,10 +2452,22 @@ compiler_import(struct compiler *c, stmt_ty s)
XXX Perhaps change the representation to make this case simpler?
*/
int i, n = asdl_seq_LEN(s->v.Import.names);
for (i = 0; i < n; i++) {
alias_ty alias = asdl_seq_GET(s->v.Import.names, i);
int r;
PyObject *level;
if (c->c_flags && (c->c_flags->cf_flags & CO_FUTURE_ABSIMPORT))
level = PyInt_FromLong(0);
else
level = PyInt_FromLong(-1);
if (level == NULL)
return 0;
ADDOP_O(c, LOAD_CONST, level, consts);
Py_DECREF(level);
ADDOP_O(c, LOAD_CONST, Py_None, consts);
ADDOP_NAME(c, IMPORT_NAME, alias->name, names);
@ -2488,9 +2500,22 @@ compiler_from_import(struct compiler *c, stmt_ty s)
int i, n = asdl_seq_LEN(s->v.ImportFrom.names);
PyObject *names = PyTuple_New(n);
PyObject *level;
if (!names)
return 0;
if (s->v.ImportFrom.level == 0 && c->c_flags &&
!(c->c_flags->cf_flags & CO_FUTURE_ABSIMPORT))
level = PyInt_FromLong(-1);
else
level = PyInt_FromLong(s->v.ImportFrom.level);
if (!level) {
Py_DECREF(names);
return 0;
}
/* build up the names */
for (i = 0; i < n; i++) {
alias_ty alias = asdl_seq_GET(s->v.ImportFrom.names, i);
@ -2509,6 +2534,8 @@ compiler_from_import(struct compiler *c, stmt_ty s)
}
}
ADDOP_O(c, LOAD_CONST, level, consts);
Py_DECREF(level);
ADDOP_O(c, LOAD_CONST, names, consts);
Py_DECREF(names);
ADDOP_NAME(c, IMPORT_NAME, s->v.ImportFrom.module, names);