The Python programming language has support for lists, a list is a collection. It can be a collection of numbers, strings or other types of data.
The example below defines the list x:
x = [ 1,2,3,4,5,6,7,8 ]
How do you get only a part of the list?
You may think a for loop, which does the job, but there's an easier way.
The Pythonic way is by defining brackets with start and ending position.
In between you write a colon, not a comma. Like this:
This looks similar to defining a list, but instead it takes a slice of the list.
This starts at the 2nd position (the element in Python is zero), and ends at the 4th position (3rd counting from zero). This may be a bit confusing initially.
>>> x = [1,2,3,4,5,6,7,8] >>> x[1:3] [2, 3] >>> x[0:2] [1, 2] >>> x[0:3] [1, 2, 3] >>>
If you want to start from the first character, you can leave the starting number out:
>>> x[:2] [1, 2] >>> x[:3] [1, 2, 3] >>>
To create a new list, you can just do this:
>>> z = x[:2] >>> z [1, 2] >>>
You can use a list as an object, it supports function calls. This lets you sort the list, remove elements and more.
Top comments (1)
In examples like this it might be clearer for your list to contain something like ["a", "b", "c", "d", ...] to avoid confusion with the index values used in the slicing