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Comment by rectangletangle | Hacker News Reader

I'm a fan of Python's conditional expressions.

    foo = bar if qux is None else baz

They're particularly interesting when combined with comprehensions.

    ['a' if i % 2 == 0 else 'b' for i in range(10)]

Though this particular example can be expressed much more concisely.

    ['a', 'b'] * 5

Before the conditional expression was introduced to Python I sometimes wrote things like

    foo = [baz, bar][qux is None]

That's a Pythonization of C's conditional operator.

    foo = qux == NULL ? bar : baz;

Of course, C does not do list comprehensions.

i didnt realize you could add the if statement in the comprehension where you did

    ['a' if i % 2 == 0 else 'b' for i in range(10)]

very cool!

I was only aware of code like

    ['a' for i in range(10) if i % 2 == 0]

i didnt realize you could add the if statement in the comprehension where you did

    ['a' if i % 2 == 0 else 'b' for i in range(10)]

very cool!

I was on aware of code like

    ['a' for i in range(10) if i % 2 == 0]