Python Built-in Types

Contents

  1. Python Built-in Types
    1. ByteArray
    2. Bytes
    3. Complex
    4. Dict
    5. Float
    6. FrozenSet
    7. Int
    8. List
    9. MemoryView
    10. Set
    11. Str
    12. Tuple

ByteArray

A mutable bytes object. The following are equivalent declarations: 

ba = bytearray(b'...'))
ba = bytearray([46, 46, 46]).

Note that iterating over a bytearray yeilds int values, not byte values.

In the context of type annotations, try: 

ba: bytes = bytearray(b'abc'))

Bytes

In the context of type annotations, try: 

b: bytes = b"abc"

Complex

Dict

In the context of type annotations, try: 

d: dict[str, int] = {"1": 1}

Float

FrozenSet

In the context of type annotations, try: 

def __init__(self) --> None:
    self._options: frozenset[str] = frozenset([1, 2])

Int

List

In the context of type annotations, try: 

l: list[str] = ["ham", "spam"]

MemoryView

An interface into internal memory of objects.

In the context of type annotations, try: 

mv: bytes = memoryview(obj)

Set

In the context of type annotations, try: 

s: set[str] = set(["A", "B", "A"])

Str

Tuple

In the context of type annotations, try: 

single: tuple[int] = [1]
double: tuple[int, int] = [1, 2]
nple: tuple[int, ...] = [1, 2, 3, 4, 5]

The tuple[T, ...] annotation checks for homogenous typing. To allow for a a variable number of any values, try: 

from typing import Any

something: tuple[Any, ...] = [1, "1"]

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