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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_pythonpath(self, at_start=False):

 """Get project path as a list to be added to PYTHONPATH"""

        if at_start:
            current_path = self.get_option('current_project_path',
                                           default=None)
        else:
            current_path = self.get_active_project_path()
        if current_path is None:
            return []
        else:
            return [current_path]