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#4748 lambda generators shouldn't return values

This commit is contained in:
Benjamin Peterson 2008-12-27 18:24:11 +00:00
parent c3a9803410
commit 8d5934b25d
3 changed files with 18 additions and 1 deletions
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10
Lib/test/test_generators.py
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@ -928,6 +928,16 @@ Test the __name__ attribute and the repr()
'f' 'f'
>>> repr(g) # doctest: +ELLIPSIS >>> repr(g) # doctest: +ELLIPSIS
'<generator object f at ...>' '<generator object f at ...>'
Lambdas shouldn't have their usual return behavior.
>>> x = lambda: (yield 1)
>>> list(x())
[1]
>>> x = lambda: ((yield 1), (yield 2))
>>> list(x())
[1, 2]
""" """
# conjoin is a simple backtracking generator, named in honor of Icon's # conjoin is a simple backtracking generator, named in honor of Icon's

2
Misc/NEWS
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@ -83,6 +83,8 @@ Core and Builtins
- Issue #4509: Various issues surrounding resize of bytearray objects to - Issue #4509: Various issues surrounding resize of bytearray objects to
which there are buffer exports. which there are buffer exports.
- Issue #4748: Lambda generators no longer return a value.
Library Library
------- -------

7
Python/compile.c
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@ -1534,7 +1534,12 @@ compiler_lambda(struct compiler *c, expr_ty e)
c->u->u_argcount = asdl_seq_LEN(args->args); c->u->u_argcount = asdl_seq_LEN(args->args);
VISIT_IN_SCOPE(c, expr, e->v.Lambda.body); VISIT_IN_SCOPE(c, expr, e->v.Lambda.body);
ADDOP_IN_SCOPE(c, RETURN_VALUE); if (c->u->u_ste->ste_generator) {
ADDOP_IN_SCOPE(c, POP_TOP);
}
else {
ADDOP_IN_SCOPE(c, RETURN_VALUE);
}
co = assemble(c, 1); co = assemble(c, 1);
compiler_exit_scope(c); compiler_exit_scope(c);
if (co == NULL) if (co == NULL)