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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def global_variables(self):
 """ Return an iterator over this module's global variables. The iterator will yield a ValueRef for each global variable. Note that global variables don't include functions (a function is a "global value" but not a "global variable" in LLVM parlance) """

        it = ffi.lib.LLVMPY_ModuleGlobalsIter(self)
        return _GlobalsIterator(it, dict(module=self))