Mercurial > cpython-lru_cache-weakref
diff Python/compile.c @ 16658:1a5a441772ff legacy-trunk
Bug #132313 error message confusing for assignment in lambda.
They're actually complaining about something more specific, an assignment
in a lambda as an actual argument, so that Python parses the
lambda as if it were a keyword argument. Like f(lambda x: x[0]=42).
The "lambda x: x[0]" part gets parsed as if it were a keyword, being
bound to 42, and the resulting error msg didn't make much sense.
| author | Tim Peters <tim.peters@gmail.com> |
|---|---|
| date | Sun, 18 Feb 2001 04:45:10 +0000 |
| parents | 79568c0d3e77 |
| children | b955e74955d5 |
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--- a/Python/compile.c Sun Feb 18 03:30:53 2001 +0000 +++ b/Python/compile.c Sun Feb 18 04:45:10 2001 +0000 @@ -1522,8 +1522,15 @@ m = CHILD(m, 0); } while (NCH(m) == 1); if (TYPE(m) != NAME) { + /* f(lambda x: x[0] = 3) ends up getting parsed with + * LHS test = lambda x: x[0], and RHS test = 3. + * SF bug 132313 points out that complaining about a keyword + * then is very confusing. + */ com_error(c, PyExc_SyntaxError, - "keyword can't be an expression"); + TYPE(m) == lambdef ? + "lambda cannot contain assignment" : + "keyword can't be an expression"); } else { PyObject *v = PyString_InternFromString(STR(m));