I often get burned by doing something like `key = "player" + playerId`. Unfortunately, playerId is an int, and I forget that even though most other languages b

I often get burned by doing something like `key = "player" + playerId`. Unfortunately, playerId is an int, and I forget that even though most other languages besides C/C++ will convert that for me, Python will not, so I get a runtime exception. Same thing with `print "no space after this" + number`, because I get used to `print "space after this", number` and then sometimes I don't want the space and inevitably I forget to do `str(number)`. Mind you, this is the sort of thing you usually discover quickly, but it's also the sort of thing that most other languages will catch at compile time.