short-circuit behavior anomaly?

[Terry Reedy]

"logosity" <wecaputo at thoughtworks.com> wrote in message
news:mailman.1015657336.24581.python-list at python.org...
> Hi,
>
> I was working through this tutorial:
> http://gnosis.cx/publish/programming/charming_python_13.txt
>
> Which shows the statements in the following functions (imp and fn)
as
> equivalent:
>
> def pr(s): print s

By default, functions return None, which is false.  For this function
to work right in context below, you must return a true value, such as
1.  If you have copied from tutorial accurately, it is incorrect and
you should report bug.

> def imp():
>     if x == 1: pr('one')
>     elif x == 2: pr('two')
>     else: pr('other')
>
> def fn():
>     (x == 1 and pr('one')) \
>  or (x == 2 and pr('two')) \
>  or (pr('other'))

When pr return None, no 'short-circuit occurs and pr('other') is
called regardless of value of x.  I personally use and/or to simulate
conditional expressions, but one *must* be careful when doing so.

Terry J. Reedy