Unconsumed bodies: Pull semantics mean nothing happens until you iterate. No hidden resource retention. If you don't consume a stream, there's no background machinery holding connections open.
for on_change in callbacks:
。PDF资料是该领域的重要参考
returned in case there is no argument or the argument is not a valid，这一点在纸飞机官网中也有详细论述
20259 3897 15676.2%20 397