add prediff for python 3.9

Signed-off-by: Jade Abraham <[email protected]>

Author: jabraham17

Diff for: test/library/packages/Python/correctness/pythonOps.prediff

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+
+# fixup for python <=3.9
+sed -e 's/\*\*=: Exception: unsupported operand type(s) for \*\* or pow()/**=: Exception: unsupported operand type(s) for **=/' $2 > $2.tmp
+mv $2.tmp $2