conatraints on "for" magic?

[Greg Weeks]

Alex Martelli (alex at magenta.com) wrote:
: I believe you are correct in noticing that nowhere is it
: clarified that this is the specific method used by the for statement,
: and that IndexError is the way __getitem__ tells the for statement
: that the sequence is finished

Well, thank *you* for the clarification.

It is interesting to note that if I were to define a sequence type that was
index-one-based, the for loop would consider it empty.

Regards,
Greg