Not every path of _uriToData returns a copy
The docstring of _uriToData says, "returns a copy of the value found at uri". This is not the case for the return statement in line 357. Change either docstring or return a copy.
Aufgrund einer Wartung am 14.05 von 8:00 bis 09:00 Uhr wird das System kurzfristig nicht zur Verfügung stehen. -- Due to maintenance on May the 14th from 8:00 am to 09:00 am the system will temporarily not be available.
The docstring of _uriToData says, "returns a copy of the value found at uri". This is not the case for the return statement in line 357. Change either docstring or return a copy.