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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(self):
 """Convert the notebook to a python script and execute it, returning the local context as a dict"""


        from nbformat import read
        from nbconvert.exporters import export_script
        from cStringIO import StringIO

        notebook = read(StringIO(self.record.unpacked_contents), 4)

        script, resources = export_script(notebook)

        env_dict = {}

        exec (compile(script.replace('# coding: utf-8', ''), 'script', 'exec'), env_dict)

        return env_dict