[Tutor] python 2.2 and 2.3

[peter hodgson]

OUCH! i just discovered that the function printTwice() was presumed to
be already defined in the interactive session in question: but i'm
still in the dark about the interactive syntax, and 2.3 vs. 2.2 in
general;

minutes ago i wrote:

i'm afraid my python 2.2 tutorial  may be out of step with python 2.3;

HERE'S THE EXCERPT FROM THE 2.2 TUTORIAL

def catTwice(part1, part2):
  cat = part1 + part2
  printTwice(cat)

This function takes two arguments, concatenates them, and then prints
the result twice. We can call the function with two strings:

>>> chant1 = "Pie Jesu domine, "
>>> chant2 = "Dona eis requiem."
>>> catTwice(chant1, chant2)
Pie Jesu domine, Dona eis requiem. Pie Jesu domine, Dona eis requiem. 

HERE'S WHAT HAPPENED WHEN I TRIED TO TEST THE SUSPICIOUS  printTwice():

>>> printTwice('forty')
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
NameError: name 'printTwice' is not defined

HERE'S WHAT HAPPENED WHEN I TRIED TO DEFINE THE FUNCTION AND CALL IT:

>>> def catTwice(part1, part2)
  File "<stdin>", line 1
    def catTwice(part1, part2)
                             ^
SyntaxError: invalid syntax
>>> def catTwice(part1, part2):
...    cat = part1 + part2
...    printTwice(cat)
... chant1 = "pie Jesu domine,"
  File "<stdin>", line 4
    chant1 = "pie Jesu domine,"
         ^
SyntaxError: invalid syntax
>>> 

HERE'S WHAT HAPPENED WHEN I TRIED TO RUN THE FILE cat.py:

bash-2.05b$ python cat.py
Traceback (most recent call last):
  File "cat.py", line 7, in ?
    catTwice(chant1, chant2)
  File "cat.py", line 3, in catTwice
    printTwice(cat)
NameError: global name 'printTwice' is not defined