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| author | Benjamin Peterson <benjamin@python.org> | 2009-07-20 20:28:08 (GMT) |
|---|---|---|
| committer | Benjamin Peterson <benjamin@python.org> | 2009-07-20 20:28:08 (GMT) |
| commit | 4879c907ce32655e76c74aee9f49e4be99b862af (patch) | |
| tree | 16dda3717a5358bd000a44e9a17a6bfb6e60d4c1 /Python/ast.c | |
| parent | a2514f4ce9b8333659aae057b3e9f38147151b54 (diff) | |
| download | cpython-4879c907ce32655e76c74aee9f49e4be99b862af.zip cpython-4879c907ce32655e76c74aee9f49e4be99b862af.tar.gz cpython-4879c907ce32655e76c74aee9f49e4be99b862af.tar.bz2 | |
the Slice in x[::] has to have step as None to help the interpreter
Diffstat (limited to 'Python/ast.c')
| -rw-r--r-- | Python/ast.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/Python/ast.c b/Python/ast.c index 6ccd02f..0644da8 100644 --- a/Python/ast.c +++ b/Python/ast.c @@ -1471,7 +1471,21 @@ ast_for_slice(struct compiling *c, const node *n) ch = CHILD(n, NCH(n) - 1); if (TYPE(ch) == sliceop) { - if (NCH(ch) != 1) { + if (NCH(ch) == 1) { + /* + This is an extended slice (ie "x[::]") with no expression in the + step field. We set this literally to "None" in order to + disambiguate it from x[:]. (The interpreter might have to call + __getslice__ for x[:], but it must call __getitem__ for x[::].) + */ + identifier none = new_identifier("None", c->c_arena); + if (!none) + return NULL; + ch = CHILD(ch, 0); + step = Name(none, Load, LINENO(ch), ch->n_col_offset, c->c_arena); + if (!step) + return NULL; + } else { ch = CHILD(ch, 1); if (TYPE(ch) == test) { step = ast_for_expr(c, ch); |