How to add else in python

Question

I have some troubles with next statement:

demo = json.loads(raw)
c = 'Return To Sender (Dub Mix)'
for i in (i for i, tr in enumerate(demo['tracks']) if c in tr['title']):
     print(i)

It works as it should, but how to add else, becouse c not always in tr['title']

The demo object:

{
'mixes': [],
'packs': [],
'stems': [],
'tracks': [{
    'id': 7407969,
    'mix': 'Original Mix',
    'name': 'Return To Sender',
    'title': 'Return To Sender (Original Mix)',
}, {
    'id': 7407971,
    'mix': 'Matrey Remix',
    'name': 'Return To Sender',
    'title': 'Return To Sender (Matrey Remix)',
}, {
    'id': 9011142,
    'mix': 'Matrey Remix',
    'name': 'Return To Sender',
    'title': 'Return To Sender (Matrey Remix)',
}, {
    'id': 7846774,
    'mix': 'Matrey Remix',
    'name': 'Return To Sender',
    'title': 'Return To Sender (Matrey Remix)',
}, {
    'id': 7407969,
    'mix': 'Original Mix',
    'name': 'Return To Sender',
    'title': 'Return To Sender (Original Mix)',
}, {
    'id': 9011141,
    'mix': 'Original Mix',
    'name': 'Return To Sender',
    'type': 'track',
}, {
    'id': 7789328,
    'mix': 'Original Mix',
    'name': 'Return To Sender',
    'title': 'Return To Sender (Original Mix)',
}]

}

Simply add else after print(i) for else we don't need to check any condition so add else: — Abi, Apr 04 '17 at 06:32
Possible duplicate of [if/else in Python's list comprehension?](http://stackoverflow.com/questions/4260280/if-else-in-pythons-list-comprehension) — abhinav, Apr 04 '17 at 06:34
disclaimer: not down voter, but please consider adding runnable code. Where does `c` spring up from? — Paul Rooney, Apr 04 '17 at 06:42
@PaulRooney: Thanks for the help, sometimes i forget about the rules — Aaron, Apr 04 '17 at 06:56

score 1 · Accepted Answer · edited May 23 '17 at 12:17

I would suggest:

for i, tr in enumerate(demo['tracks']):
    if c in tr['title']:
        print(i)
    else:
        pass # do something else

But if you must have it in the generator expression, you have to replace the filter if at the end of the for loop for-in-if with if-else-for-in:

for i in (i if c in tr['title'] else None for i, tr in enumerate(demo['tracks'])):
    print(i)

See if else in a list comprehension

score 0 · Answer 2 · answered Apr 04 '17 at 06:43

0

you can try this one liner!.

guessing you only wants to print (i) when condition gets true

 for i in (i for i, tr in enumerate(demo['tracks']):
     print(i) if c in tr['title']) else ''

answered Apr 04 '17 at 06:43

DexJ

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How to add else in python

2 Answers2