asynchronous downloading

[Richard Baron Penman]

>> I want to download content asynchronously. This would be
>> straightforward to do threaded or across processes, but difficult
>> asynchronously so people seem to rely on external libraries (twisted
>> / gevent / eventlet).
>
>
> Exactly - the fact it's difficult is why those tools compete.

It is difficult in Python because the async libraries do not offer
much. Straightforward in some other languages.

Do you know why there is little support for asynchronous execution in
the standard libraries?
For large scale downloading I found thread pools do not scale well.

Richard