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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 get_assignment(self):
 """Parse the given json plan in dict format."""

        try:
            plan = json.loads(open(self.args.plan_file_path).read())
            return plan_to_assignment(plan)
        except IOError:
            self.log.exception(
                'Given json file {file} not found.'
                .format(file=self.args.plan_file_path),
            )
            raise
        except ValueError:
            self.log.exception(
                'Given json file {file} could not be decoded.'
                .format(file=self.args.plan_file_path),
            )
            raise
        except KeyError:
            self.log.exception(
                'Given json file {file} could not be parsed in desired format.'
                .format(file=self.args.plan_file_path),
            )
            raise