Python has a built-in method, called
range(start, stop), that allows you to easily create arrays whose values are integers, starting from
start and ending before
stop (exclusive). The following code creates a list of integers from 0 to 9:
range(10) [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
Providing only one argument to the
range() method will create a list of integers from 0 to the value of the argument given.
Oftentimes you'll want to create a range and add it to the end of a list. In order to do this, you'll want to use the list's
extend() method, which takes an iterable of values, like a list, and adds them to the end of the target list.
Here you can see an example of adding a list to the end of another list using
1, 2, 3] list_b = [4, 5, 6] list_a.extend(list_b) list_a [1, 2, 3, 4, 5, 6]list_a = [
Finally, to create a range and add it to the end of a list, you would do something very similar to the code above, but using the
range() method instead of a predefined list:
1, 2, 3] my_list.extend(range(4, 7)) my_list [1, 2, 3, 4, 5, 6]my_list = [
You'll commonly see that the return value of the
range method is wrapped in a list. This is because
range doesn't actually return a
list, but instead an object that implements the
collections.abc.Sequence methods. While this object is iterable and
list-like, it's best practice to explicitly convert it to a
list before using it.
Note that since Python lists are not typed, you can add a range to any list, regardless of what values it contains. For example:
'hello', 'world'] my_list.extend(range(3)) my_list ['hello', 'world', 0, 1, 2]my_list = [
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