Patrick Stewart:
Both languages have programming bugs and bad decisions. Python fix them without disrupting schedule and usability. D says "suck it up for next X years while we fix it" or "You have some obscure 4 year old version without that bug".
Python C interpreter is also far simpler than designing a new system language, and writing its compiler and standard library. And behind Python there are far more developers and users.
Bye, bearophile