If/else in python list comprehension











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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?










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  • 2




    Pleae provide a Minimal, Complete, and Verifiable example with sample input and expected output.
    – timgeb
    Nov 10 at 22:48















up vote
-1
down vote

favorite












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?










share|improve this question


















  • 2




    Pleae provide a Minimal, Complete, and Verifiable example with sample input and expected output.
    – timgeb
    Nov 10 at 22:48













up vote
-1
down vote

favorite









up vote
-1
down vote

favorite











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?










share|improve this 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?







python list-comprehension






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asked Nov 10 at 22:46









Frendom

195




195








  • 2




    Pleae provide a Minimal, Complete, and Verifiable example with sample input and expected output.
    – timgeb
    Nov 10 at 22:48














  • 2




    Pleae provide a Minimal, Complete, and Verifiable example with sample input and expected output.
    – timgeb
    Nov 10 at 22:48








2




2




Pleae provide a Minimal, Complete, and Verifiable example with sample input and expected output.
– timgeb
Nov 10 at 22:48




Pleae provide a Minimal, Complete, and Verifiable example with sample input and expected output.
– timgeb
Nov 10 at 22:48












1 Answer
1






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up vote
0
down vote



accepted










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.






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  • EDIT: it doesnt work, atm it returns " even if in file is word which sum of letter is passed in argument
    – Frendom
    Nov 11 at 19:15










  • @Frendom (1) Have you checked that it works with your original function? (2) Can you give a simple example for testing?
    – Michael Butscher
    Nov 11 at 22:23











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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes








up vote
0
down vote



accepted










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.






share|improve this answer























  • EDIT: it doesnt work, atm it returns " even if in file is word which sum of letter is passed in argument
    – Frendom
    Nov 11 at 19:15










  • @Frendom (1) Have you checked that it works with your original function? (2) Can you give a simple example for testing?
    – Michael Butscher
    Nov 11 at 22:23















up vote
0
down vote



accepted










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.






share|improve this answer























  • EDIT: it doesnt work, atm it returns " even if in file is word which sum of letter is passed in argument
    – Frendom
    Nov 11 at 19:15










  • @Frendom (1) Have you checked that it works with your original function? (2) Can you give a simple example for testing?
    – Michael Butscher
    Nov 11 at 22:23













up vote
0
down vote



accepted







up vote
0
down vote



accepted






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.






share|improve this answer














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.







share|improve this answer














share|improve this answer



share|improve this answer








edited Nov 10 at 22:55

























answered Nov 10 at 22:50









Michael Butscher

3,91311319




3,91311319












  • EDIT: it doesnt work, atm it returns " even if in file is word which sum of letter is passed in argument
    – Frendom
    Nov 11 at 19:15










  • @Frendom (1) Have you checked that it works with your original function? (2) Can you give a simple example for testing?
    – Michael Butscher
    Nov 11 at 22:23


















  • EDIT: it doesnt work, atm it returns " even if in file is word which sum of letter is passed in argument
    – Frendom
    Nov 11 at 19:15










  • @Frendom (1) Have you checked that it works with your original function? (2) Can you give a simple example for testing?
    – Michael Butscher
    Nov 11 at 22:23
















EDIT: it doesnt work, atm it returns " even if in file is word which sum of letter is passed in argument
– Frendom
Nov 11 at 19:15




EDIT: it doesnt work, atm it returns " even if in file is word which sum of letter is passed in argument
– Frendom
Nov 11 at 19:15












@Frendom (1) Have you checked that it works with your original function? (2) Can you give a simple example for testing?
– Michael Butscher
Nov 11 at 22:23




@Frendom (1) Have you checked that it works with your original function? (2) Can you give a simple example for testing?
– Michael Butscher
Nov 11 at 22:23


















 

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