Operation on list in list of list using list comprehension

I am trying to print a list of tuples containing the size of each list from list of list

ex:

l=[1,3,4,5,6,7],[1,1],[1,9,9]

print(list(map(lambda x: ("sum",sum(1 for i in l)),l))) 

• The output is coming as [(‘sum’, 3), (‘sum’, 3), (‘sum’, 3)]

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  I am trying to get it using list comprehension.

• The expected output I want should be
  [(‘sum’,6),(‘sum’,2),(‘sum’,3)]

>Solution :

You have a bug, it should be

sum(1 for i in x) # x, not l

Also, len(x) would give you the same number.

The list-comprehension solution is

[('sum', len(x)) for x in l]