[Python-Dev] Passing actual read size to urllib reporthook

["Martin v. Löwis"]

Guido van Rossum schrieb:
> Is there any reason to assume the data size is ever less than the
> block size except for the last data block? It's reading from a
> pseudo-file tied to a socket, but Python files tend to have the
> property that read(n) returns exactly n bytes unless at EOF.

Right: socket._fileobject will invoke recv as many times as
necessary to read the requested amount of data. I was somehow
assuming that it maps read() to read(2), which, in turn, would
directly map to recv(2), which could return less data.

So it's a semantic change only for the last block.

Regards,
Martin