mirror of https://github.com/python/cpython
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.
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@ -1522,8 +1522,15 @@ com_argument(struct compiling *c, node *n, PyObject **pkeywords)
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m = CHILD(m, 0);
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} while (NCH(m) == 1);
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if (TYPE(m) != NAME) {
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/* f(lambda x: x[0] = 3) ends up getting parsed with
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* LHS test = lambda x: x[0], and RHS test = 3.
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* SF bug 132313 points out that complaining about a keyword
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* then is very confusing.
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*/
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com_error(c, PyExc_SyntaxError,
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"keyword can't be an expression");
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TYPE(m) == lambdef ?
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"lambda cannot contain assignment" :
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"keyword can't be an expression");
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}
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else {
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PyObject *v = PyString_InternFromString(STR(m));
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