Coding boot camps are everywhere these days, promising to arm you with the most highly sought skill in the modern economy: computer programming. While many programs charge thousands of dollars for just a few months of instruction, one school, started in Paris by the French billionaire Xavier Niel, offers a three-year curriculum for free. This week Bloomberg Technology's Sarah McBride and Marie Mawad report on Ecole 42's newly-opened Silicon Valley branch, which is hoping to repeat the Paris school's success in training underprivileged youth. But things haven't quite turned out the way administrators were expecting.