The John Cleese Memoir, Now Anyway, is a fun read. It's fascinating how the young threads of the various Python actors fell together, so long ago, and amazing how many other well-known comic Names were involved with the Gestation of the Flying Circus. And what a fluke it was that BBC not only approved their undescribed, potential show; but continuously allowed the Pythons to get away with such blasphemous nonsense.
And given the skits and bits that they did, they really pushed the envelope .