extract any value from the nesting of a list

l[0] is a tuple called (5,6), so you can look at the second one.

printl[0][1]
# ->6

Or (although this usage may limit the desired situation), they will give you a random disclosure of the types of tuples and lists (sequence unpacking).

(x,y), *rest=l
printy
# ->6

l[0:1] is a Python slice statement and cannot retrieve any value.l[0][1] is just a simple l=[(5, 6), 7, 8, 9].

If you want to get elements of arbitrary depth from a data structure that mixes lists, tuples, and dictionaries, you don't need to do anything else.

For example, if you want to extract elements from a nest in a list l with l[b][c]...[x], but you don't know the number of indexes idxlist=[a,b,c,...,x], you can use the for statement like this

l=[(5, 6), 7, 8, 9]
idxlist=[0,1]

found_element=l
for index in idxlist:
    found_element=found_element [index]
print found_element#6

Alternatively, you can create it like this with the reduce function.

printreduce(lambdaobj,key:obj[key],
             idxlist,
             l)l)