Вопрос StackOverflow

How do I convert the following for-loop containing an if/else into a list comprehension?

results = []
for x in xs:
    results.append(f(x) if x is not None else '')

It should yield '' if x is None, and otherwise f(x). I tried:

[f(x) for x in xs if x is not None else '']

but it gives a SyntaxError. What is the correct syntax?

_{See Does Python have a ternary conditional operator? for info on ... if ... else ....}
_{See List comprehension with condition for omitting values based on a condition: [... for x in xs if x cond].}
_{See `elif` in list comprehension conditionals for elif.}

if/else in a list comprehension