Sequential Datatypes¶

Sequential Datatypes ¶

Sequential Datatypes are a sequence of elements

Strings: sequence of Unicode code points
Lists: mutable sequence of elements of any type (⟶ recursive)
Tuples: like lists, but immutable
Binary data …
- Bytes: like strings, only binary - there is no
  encoding. Immutable
- Byte arrays: mutable arrays of raw bytes
Common set of operations
- Indexing
- Concatenation
- Several specialities: slicing …
Very powerful (albeit a bit hard to read)

Sequence Elements ¶

Elements are numbered

Starting at zero

../../../../../../_images/0200-sequential-types-index.svg

Sequence Membership ¶

The in operator …

>>> 2 in ['one', 2, 'three']
True
>>> 3 in ['one', 2, 'three']
False
>>> 'three' in ['one', 2, 'three']
True
>>> 'three' not in ['one', 2, 'three']
False

Cool for short sequences
Sequential search
⟶ probably not the right datastructure for searches

Sequence Multiplication ¶

String multiplication

>>> 'blah' * 5
'blahblahblahblahblah'

Arbitrary sequence multiplication

>>> [1, 2, 3] * 5
[1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3]
>>> ['one', 2, 'three'] * 3
['one', 2, 'three', 'one', 2, 'three', 'one', 2, 'three']