When will perl6 become the standard perl?
Python 2 is not being developed actively, aside from security updates, so it is permanently frozen at 2.7, with the intent of removing support entirely eventually (though not for a while).
It's not really a like comparison to compare the two.
It wasn't always that way, however much certain luminaries try to retcon. Perl6 was originally intended to be, well, the next version of perl; it was only after the community's rejection that the decision to continue perl5 happened. It's not beyond the realms of possibility that the same thing could happen to python (though I certainly hope not, and stories like this suggest we're reaching the tipping point).
The lack of any usable Perl 6 implementation by the time of Perl 5.12 did more to promote the continuation of Perl 5 as its own project than any specific rejection of Perl 6. When the plan was for Perl 6 to replace Perl 5, the idea that Perl 5.12 would migrate to Parrot as a VM so that Perl 5 and Perl 6 code could run in the same process.