This was the reason a numeric array to a real power was not working.

1d5e80cb · Guido van Rossum · 2771359d · 1d5e80cb
Commit 1d5e80cb authored Apr 03, 1998 by Guido van Rossum
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Objects/abstract.c Objects/abstract.c +2 -1

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--- a/Objects/abstract.c
+++ b/Objects/abstract.c
@@ -463,7 +463,8 @@ do_pow(v, w)
 				"pow() requires numeric arguments");
 		return NULL;
 	}
-	if (PyFloat_Check(w) && PyFloat_AsDouble(v) < 0.0) {
+	if (PyFloat_Check(v) && PyFloat_Check(w) &&
+	    PyFloat_AsDouble(v) < 0.0) {
 		if (!PyErr_Occurred())
 		    PyErr_SetString(PyExc_ValueError,
 				    "negative number to float power");