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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 authenticate(self, provider=None, identifier=None):
        "Fetch user for a given provider by id."
        provider_q = Q(provider__name=provider)
        if isinstance(provider, Provider):
            provider_q = Q(provider=provider)
        try:
            access = AccountAccess.objects.filter(
                provider_q, identifier=identifier
            ).select_related('user')[0]
        except IndexError:
            return None
        else:
            return access.user