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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 request_fetch(self, user, repo, request, pull=False, force=False): #pragma: no cover
        '''Fetches given request as a branch, and switch if pull is true

        :param repo: name of the repository to create

        Meant to be implemented by subclasses
        '''
        raise NotImplementedError