If/else in python list comprehension

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?

asked Nov 10 at 22:46

Frendom

266

2

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

add a comment |

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?

asked Nov 10 at 22:46

Frendom

266

2

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

add a comment |

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?

asked Nov 10 at 22:46

Frendom

266

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

asked Nov 10 at 22:46

Frendom

266

asked Nov 10 at 22:46

Frendom

266

asked Nov 10 at 22:46

Frendom

266

asked Nov 10 at 22:46

Frendom

266

asked Nov 10 at 22:46

Frendom

266

2

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

add a comment |

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

add a comment |

1 Answer
1

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.

edited Nov 10 at 22:55

answered Nov 10 at 22:50

Michael Butscher

3,93811320

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

add a comment |

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1 Answer
1

active

oldest

votes

1 Answer
1

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.

edited Nov 10 at 22:55

answered Nov 10 at 22:50

Michael Butscher

3,93811320

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

add a comment |

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.

edited Nov 10 at 22:55

answered Nov 10 at 22:50

Michael Butscher

3,93811320

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

add a comment |

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.

edited Nov 10 at 22:55

answered Nov 10 at 22:50

Michael Butscher

3,93811320

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.

edited Nov 10 at 22:55

answered Nov 10 at 22:50

Michael Butscher

3,93811320

edited Nov 10 at 22:55

answered Nov 10 at 22:50

Michael Butscher

3,93811320

answered Nov 10 at 22:50

Michael Butscher

3,93811320

answered Nov 10 at 22:50

Michael Butscher

3,93811320

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

add a comment |

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

add a comment |

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