Can I change the for iteraotr variable in a loop?

[Xavier Wang <weasley.wx@...>]

hi list and Roberto :-)

the PiL says you should never change the for iteraotr variable, but I
can not found this in reference, so I want to ask whether this
variable is just a normal variable? that is, if I change its value,
except the value of iterator will reset before the next loop is
executed, what else behavior will happen? or is this a undefined
hebahvior?

regards,
Xavier