Sequence Types - Range

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Range

MUTABILITY: Immutable

Creates an immutable sequence of integers. This class is commonly used to create a range of indexes to loop over. It can be used to fill other container types with content, if desired.

If you don’t need to interact with the sequence, using a range is cheaper then using a list or tuple as the range object only stores the start, stop and step values (calculating individual items and sub-ranges on the fly as required).

Ranges can only be created using the range constructor.

range(start=0, end=None, step=1),

Some examples:

• Create a sequence to represent the values 0 to 9:

  >>> foo = range(10)
  >>> foo
  range(10)
  

  In this case, foo points to the range object. Feed the range object to the tuple or list constructor to see the actual values, as in:

  >>> list(foo)
  [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
  

• Populate a list with values between 0 and 9, skipping every other one:

  >>> list(range(0, 10, 2))
  [0, 2, 4, 6, 8]
  

• Populate a list with values between -1 and -9, skipping every other one:

  >>> list(range(-1, -10, -2))
  [-1, -3, -5, -7, -9]
  

Range Specific Methods

There are no range specific methods.

Try it!

Try creating the following objects:

• A list of the integers between 0 and 15.
• A list of the integers between 5 and 20.
• A list of every 5th integer between 5 and 20.