private boolean setVariable(String varName, Object obj) {
		if (builtinModule.__findattr__(varName) == null) {
			set(varName, obj);
			return true;
		}
		return false;
	}
Safely sets a variable in the interpreter's namespace. This first checks to
make sure that we are not overriding a builtin Python symbol.

@param varName The name of variable.
@param obj The value of the variable.
@return True if the variable was set; false if it already existed and wasn't set.
Ghidra/Features/Jython/src/main/java/ghidra/jython/GhidraJythonInterpreter.java