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

• Jon Clements: You need to check that both of them are present in dates?
• Don: You can use sets and their operators: docs.python.org/2/library/sets.html

Answer 1

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

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

Answer 2

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