One of the interesting things about Python for compiler geeks is that itis a partially implicit context language, in that line indentation issignificant. Implicit context languages been out of favour for a verylong time, and most parsing techniques these days are geared towardsstream oriented grammars.

(By 'implicit context languages' I mean ones where state changes likeentering and exiting blocks are implicit in the difference betweenlines, such as different indentation levels. By contrast, streamoriented languages use explicit markers for such state changes, like