Python How to check if data in list

Question

I have a code:

dates = []

dates.append(['imie', 'nazwisko'])
dates.append(['test', 'test2'])

How can check if "imie" and "nazwisko" is in dates?

if 'imie' and 'nazwisko' in dates - not work

Thanks for help

You can use sets and their operators: docs.python.org/2/library/sets.html — Don
– Don, Commented Jan 28, 2015 at 14:46

falsetru · Accepted Answer · 2015-01-28 14:45:00Z

3

Using any and generator expression:

>>> dates = []
>>> dates.append(['imie', 'nazwisko'])
>>> dates.append(['test', 'test2'])
>>> any(('imie' in d and 'nazwisko' in d) for d in dates)
True

UPDATE

You can also use set.issubset as suggested by Jon Clements:

>>> any({'imie', 'nazwisko'}.issubset(d) for d in dates)
True

edited Jan 28, 2015 at 14:45

answered Jan 28, 2015 at 14:35

falsetru

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1 Comment

falsetru Over a year ago

@JonClements, Thank you for comment. I added it to the answer according to you.

Benjamin James Drury · Accepted Answer · 2015-01-28 14:39:17Z

1

Well you're appending lists to dates instead of the strings, so:

for i in dates:
    if 'imie' in i or 'nazwisko' in i:
        return True
return False

edited Jan 28, 2015 at 14:39

answered Jan 28, 2015 at 14:33

Benjamin James Drury

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