如果/else在python列表理解中

Question

I would like to return random word from file, based on passed argument. But if the argument doesn't match anythning I dont want to return anything. My method looks like:

def word_from_score(self,score):
    print(random.choices([word for word in self.file if sum([LETTER_SCORES[letter] for letter in word ]) == score]))

It returns the correct word from file based on passed argument in command line, but if the argument doesnt match, i want to return nothing, like ''. How could I add else to this statement?

Answer 1

Should be:

def word_from_score(self,score):
    print(random.choices([(word if sum([LETTER_SCORES[letter] for letter in word ]) == score else "") for word in self.file]))

The (... if ... else ...) is actually the ternary operator and not part of the surrounding list comprehension.