====== Python Typing ======

Devolver el tipo de la misma clase:
<code>
from typing import Self

class Foo:
   def returns_self(self) -> Self:
      return self
</code>

Alias de tipo:
<code>
from typing import TypeAlias

Factors: TypeAlias = list[int]
</code>

Definición de un tipo (en este caso self):
<code>
from typing import TypeVar

Self = TypeVar("Self", bound="Foo")

class Foo:
   def returns_self(self: Self) -> Self:
      return self
</code>

Several types:
<code>
Union[Union[int, str], float] == Union[int, str, float]
Union[int] == int
</code>

Type or None:
''Optional[X]'' is equivalent to ''X | None'' (or ''Union[X, None]'').
<code>
Optional[str]
</code>

Class type:
<code>
class ShopifyPostView(MethodView):
    shopify_request_schema: t.Union[
        t.Type[ShopifyPaymentsRequest],
        t.Type[ShopifyRefundsRequest],
    ] = None
</code>

Object of the previous class type:
<code>
ShopifyRequestClass: t.Type = t.Optional[
    t.Union[
        t.Type[ShopifyPaymentsRequest],
        t.Type[ShopifyRefundsRequest],
    ]
]

ShopifyRequest = t.Type[ShopifyRequestClass]
</code>

====== Links ======

  * https://towardsdatascience.com/12-beginner-concepts-about-type-hints-to-improve-your-python-code-90f1ba0ac49