1. Lists - A list is a sequence
Like a string, a list is a sequence of values. In a string, the values are characters; in a list, they can be any type. The values in a list are called elements or sometimes items.
There are several ways to create a new list; the simplest is to enclose the elements in square brackets ([ and ]):
[10,20,30,40] ['crunchy frog','ram bladder','lark vomit']
The first example is a list of four integers. The second is a list of three strings. The elements of a list don’t have to be the same type. The following list contains a string, a float, an integer, and (lo!) another list:
A list within another list is nested.
A list that contains no elements is called an empty list; you can create one with empty brackets, .
As you might expect, you can assign list values to variables:
>>> cheeses =['Cheddar','Edam','Gouda'] >>> numbers =[42,123] >>> empty = >>>print(cheeses, numbers, empty) ['Cheddar','Edam','Gouda'][42,123]
Source: Allen B. Downey, http://greenteapress.com/thinkpython2/html/thinkpython2011.html
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