On Fri, 2009-07-31 at 13:11 -0700, James Stroud wrote:
> Python 2.5:
>
> mbi136-176 211% python
> *** Pasting of code with ">>>" or "..." has been enabled.
> ########################################################################
> ## ipython ##
> ########################################################################
> py> b = 4 if True else b
> py> b
> 4
>
>
> Isn't the right side supposed to be evaluated first?
Yes, the right hand side of the '=', which is evaluated from LtoR.
>From the Language Reference:
Python evaluates expressions from left to right. Notice that
while evaluating an assignment, the right-hand side is evaluated
before the left-hand side.
So the right-hand side of the '=' is evaluated first:
4 if True else b
And that's evaluated from left to right:
4
Therefore:
b = 4
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