TypeError: worker() takes 0 positional arguments but 1 was given
Solution 1:
Your worker method needs 'self' as a parameter, since it is a class method and not a function. Adding that should make it work fine.
Solution 2:
If the method doesn't require self as an argument, you can use the @staticmethod decorator to avoid the error:
class KeyStatisticCollection(DataDownloadUtilities.DataDownloadCollection):
def GenerateAddressStrings(self):
pass
@staticmethod
def worker():
pass
def DownloadProc(self):
pass
See https://docs.python.org/3/library/functions.html#staticmethod