Determine If A List Contains Other Lists

if I have a list, is there any way to check if it contains any other lists? what i mean to say is, I want to know if a list has this strcuture: [] as opposed to this structure [[]]

Solution 1:

any(isinstance(el, list) for el in input_list)

Solution 2:

You can take phihag's answer even further if you actually want a list of all the lists inside the list:

output_list = filter( lambda x: isinstance(x,list), input_list)

Solution 3:

lst1 in lst2

Yields True iff lst1 is in lst2.