There's at least a 1995 European patent application and ~500 others [listed on Google patents for Europe] up to 2009 mentioning python programming language.
In 2009 there's EP2109040A2 which demonstrates a European usage of python by a skilled practitioner in the art specifically to designate the language stewarded by PSF .
The UK company didn't miss to exactly take the same international classes (009, 042) the PSF had choosen back in 2004 when they registered the PYTHON mark with the US copyright office. So that's more distinct than what others do, even if some of those two classes also collide with other trademark registrations for PYTHON.
In 2009 there's EP2109040A2 which demonstrates a European usage of python by a skilled practitioner in the art specifically to designate the language stewarded by PSF .