The Clippers never threw a pity party last week after learning guard Patrick Beverley would be sidelined for the rest of the season after undergoing right knee surgery. They didn’t feel sorry for themselves. They didn’t curse their fate or scream in the night. What they did was regroup, win their next two games and start to feel good about themselves again. The NBA season is a long one. There are ups and downs and twists and turns and, as tempting as it might have been, the Clippers didn’t let the bad news about Beverley keep them down for long. Beverley wasn’t expected to undergo surgery despite sitting out for five games because of soreness in his knee. When he did have surgery, it wasn’t expected to be as serious as it turned out to be. It was just supposed to be a procedure to clean up damaged meniscus. Instead, Beverley also underwent microfracture surgery, a more serious procedure that could sideline him for up to nine months. Arthroscopic surgery to mend torn meniscus generally requires a layoff of between four and six weeks, which meant Beverley could have returned to the team by Jan. 1. “I think everyone was shocked,” Clippers coach Doc Rivers said Monday. The Clippers moved on without Beverley, beating the Atlanta Hawks to end a nine-game losing streak and defeating the Sacramento Kings to end a five-game trip with a 2-3 mark heading into Monday’s home game against the Lakers at Staples Center. “You can’t feel sorry for yourself, ever, ever,” Rivers said. “Before the game in Atlanta, I told our guys, ‘I know millions of guys who would trade places right now. Right now, on your worst day, they would trade. So, there’s a lot to be thankful for. You’ve got to keep plugging away.’”