From: "holger krekel" <pyth@devel.trillke.net>
> IIRC nobody on c.l.py has come up with a real need
> for short-circuiting with the ternary op, anyway.
Here's a copy of my reply to Aahz and c.l.py:
It is necessary when:
1. One of the alternatives has a side-effect; or
2. one or both alternatives are time consuming; or
3. the validity of the alternatives depends on the outcome
of the test.
# Example where all three reasons apply
data = isinstance(source, str) ?? source.readlines() || source.split()
1. readlines() moves the file pointer
2. for long sources, both alternatives take time
3. split() is only valid for strings and readlines() is only
valid for file objects.
Raymond Hettinger
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