Check If List Contains Another List In Python
I have two lists, one containing lists of album, file pairs and the other containing only info about one photo - album (at position 0) and file (at position 1) photos = [['Trip to
Solution 1:
Similarly like photo in photos
for strings. Not just similarly, exactly like that. photo in photos
works for lists inside lists too:
>>>photos = [["Trip to Thailand", "IMG_001.jpg"], ["Latvia 2010", "IMG_001.jpg"]]>>>photo = ["Latvia 2010", "IMG_001.jpg"]>>>photo in photos
True
Membership testing against a list simply iterates over the list and uses ==
equality testing with each element to see if there is a match. Your photo
list tests as equal to the second element:
>>> photos[1] == photo
True
because all strings in both lists are equal.
Solution 2:
photos = [["Trip to Thailand", "IMG_001.jpg"], ["Latvia 2010", "IMG_001.jpg"]]
photo = ["Latvia 2010", "IMG_001.jpg"]
print (photo in photos)
True
There is no difference, you would check exactly as you would for a string.
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