Python equivalent to PHP's SPL __autoload() ??

[Ixiaus]

I was curious (and have spent an enormous amount of time on Google
trying to answer it for myself) if Python has anything remotely
similar to PHP's SPL __autoload() for loading classes on the fly??

After digging through docs I feel doubtful there is such a language
feature, but, it is possible I missed something or maybe someone has
written an extension?!?

Thanks in advance!