Checking to see if a list of lists has equal sized lists

Question

I need to validate if my list of list has equally sized lists in python

myList1 = [ [1,1] , [1,1]] // This should pass. It has two lists.. both of length 2
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Answer 1

You could try:

test = lambda x: len(set(map(len, x))) == 1

test(myList1) # True
test(myList4) # False

Basically, you get the length of each list and make a set from those lengths, if it contains a single element then each list has the same length