= Python Built-in Types =

Python has the following '''built-in types''' available at the global scope. 

<<TableOfContents>>

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== Bool ==

An object referencing one of two possible values: `True` and `False`.

Variables instantiated as `bool` are mutable but the boolean values themselves are immutable.

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== 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 [[Python/TypeAnnotation|type annotations]], try:

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

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== Bytes ==

In the context of [[Python/TypeAnnotation|type annotations]], try:

{{{
b: bytes = b"abc"
}}}

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== Complex ==

A complex number stored as real and imaginary components.

{{{
z = complex(-2.0, 0.0)
z == z.real + z.imag*1j
}}}

See the [[Python/CMath|cmath module]] for doing math with complex numbers.

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== Dict ==

In the context of [[Python/TypeAnnotation|type annotations]], try:

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

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== Float ==

A floating point number.

There are also the IEEE 754 special values:

 * `float("NaN")` representing not a number
 * `float("inf")` representing positive infinity
 * `float("-inf")` representing negative infinity

In the context of [[Python/TypeAnnotation|type annotations]], try:

{{{
f: float = 3.14
}}}

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== FrozenSet ==

In the context of [[Python/TypeAnnotation|type annotations]], try:

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

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== Int ==

In the context of [[Python/TypeAnnotation|type annotations]], try:

{{{
i: int = 0
}}}

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== List ==

In the context of [[Python/TypeAnnotation|type annotations]], try:

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

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== MemoryView ==

An interface into internal memory of objects.

In the context of [[Python/TypeAnnotation|type annotations]], try:

{{{
mv: bytes = memoryview(obj)
}}}

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== Set ==

In the context of [[Python/TypeAnnotation|type annotations]], try:

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

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== Str ==

In the context of [[Python/TypeAnnotation|type annotations]], try:

{{{
s: str = "abc"
}}}

A list of methods for `str` objects can be seen [[Python/StringMethods|here]].

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== Tuple ==

In the context of [[Python/TypeAnnotation|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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