Joining open source python projects

[Giampaolo Rodola']

Hi there,
I don't know if such a thing has been already discussed, in which case
I'm sorry.
I was wondering if there's a place for python open source projects
that need help.
It thought it would be very nice having a place where developers could
submit "help requests" for their projects and let the users view them
and eventually join them if they want to.

Does someone knows if such a service already exist or not?