On 2020-07-31, Stefan Ram <ram at zedat.fu-berlin.de> wrote: > You can write > >|>>> 1,+2, >|(1, 2) > > , but not > >|>>> (1,)+2, >|TypeError: can only concatenate tuple (not "int") to tuple > > . Why? (Python 3.9) For the obvious reason, as indicated by the error message? What are you expecting these expressions to mean?