Chapter 10: Lists

• A list within another list is said to be nested and the inner list is often called a sublist.

["hello", 2.0, 5, [10, 20]]

• in and not in are boolean operators that test membership in a sequence. We used them previously with strings and they also work here.
• Again, as with strings, the + operator concatenates lists. Similarly, the * operator repeats the items in a list a given number of times.

a_list = ['a', 'b', 'c', 'd', 'e', 'f']
print(a_list[1:3])
print(a_list[:4])
print(a_list[3:])
print(a_list[:]) 

• b = a[:] # make a clone using slice
• List Methods

• It is also important to realize that with append, the original list is simply modified. On the other hand, with concatenation, an entirely new list is created.