return True

    else:

        return False

## views

@login_required

def team_detail(request, slug):

    team = get_object_or_404(Team, slug=slug)

    state = team.get_state_for_user(request.user)

        raise Http404()

    return render(request, "teams/team_detail.html", {

        "team": team,

        "state": state,

        "can_join": can_join(team, request.user),

        "can_leave": can_leave(team, request.user),

        "can_apply": can_apply(team, request.user),

    })

@login_required

def team_join(request, slug):

    team = get_object_or_404(Team, slug=slug)

    state = team.get_state_for_user(request.user)

        raise Http404()

    if can_join(team, request.user) and request.method == "POST":

        membership, created = Membership.objects.get_or_create(team=team, user=request.user)

        membership.state = "member"

        membership.save()

        # contrib.message

        return redirect("team_detail", slug=slug)

    else:

        return redirect("team_detail", slug=slug)

@login_required

def team_leave(request, slug):

    team = get_object_or_404(Team, slug=slug)

    state = team.get_state_for_user(request.user)

        raise Http404()

    if can_leave(team, request.user) and request.method == "POST":

        membership = Membership.objects.get(team=team, user=request.user)

        membership.delete()

        # contrib.message

        return redirect("dashboard")

    else:

        return redirect("team_detail", slug=slug)

@login_required

def team_apply(request, slug):

    team = get_object_or_404(Team, slug=slug)

    state = team.get_state_for_user(request.user)

        raise Http404()

    if can_apply(team, request.user) and request.method == "POST":

        membership, created = Membership.objects.get_or_create(team=team, user=request.user)

        membership.state = "applied"

        membership.save()

        # contrib.message

        return redirect("team_detail", slug=slug)

    else:

        return redirect("team_detail", slug=slug)