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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 execute_rex_code(self, code, filename=None, shell=None, parent_environ=None, **Popen_args):
 """Run some rex code in the context. Note: This is just a convenience form of `execute_shell`. Args: code (str):
 Rex code to execute. filename (str):
 Filename to report if there are syntax errors. shell: Shell type, for eg 'bash'. If None, the current shell type is used. parent_environ: Environment to run the shell process in, if None then the current environment is used. Popen_args: args to pass to the shell process object constructor. Returns: `subprocess.Popen` object for the shell process. """

        def _actions_callback(executor):
            executor.execute_code(code, filename=filename)

        return self.execute_shell(shell=shell,
                                  parent_environ=parent_environ,
                                  command='',  # don't run any command
                                  block=False,
                                  actions_callback=_actions_callback,
                                  **Popen_args)