check if all element of multiple lists inside a list is identical

Question

How do I check if the elements of multiple lists inside a list are identical? The following code is from Checking if all elements of a List of Lists are in another List of Lists Python but it only counts the number of list in my list, not the elements the lists inside the list. Thanks in advance!

x.count(x[0]) == len(x)

It would be really helpful if you can post your code and an example. It helps in understanding the problem better. — Prakhar Verma, Jun 24 '18 at 06:11

score 0 · Accepted Answer · answered Jun 24 '18 at 06:14

0

1)You can use this:

for i in l:
    if len(set(i)) != 1:
       print('not ok')
       break
else:
    print('ok')

2) it is better to use one line statement for this purpose like below:

all([len(set(i)) == 1 for i in l])

l is list of lists.

answered Jun 24 '18 at 06:14

Mehrdad Pedramfar

score 0 · Answer 2 · answered Jun 24 '18 at 06:17

0

for prev, next in zip(l[:-1],l[1:]):
    if prev != next:
        return False
return True

answered Jun 24 '18 at 06:17

Logan

I keep rereading the question and I'm no longer sure what it is asking, so I can't tell if my answer is right. Please provide more details, if you can. – Logan Jun 24 '18 at 06:20

Austin · Answer 3 · 2018-06-24T12:56:27.007

0

Create an intermediate list storing 1 if all elements of a sublist are same. Later, check if lengths of original and intermediate lists are same:

lst = [[2,2,2], ['d']]

inter = [1 for x in lst if x[1:] == x[:-1]]
if len(lst) == len(inter):
    print(True)
else:
    print(False)

Or you just need:

if all([1 if x[1:] == x[:-1] else 0 for x in lst]):
    print(True)
else:
    print(False)

edited Jun 24 '18 at 12:56

answered Jun 24 '18 at 06:18

Austin

3 Answers3