Base class for protocol classes.


Helper for managing files using static names together with

Module Contents

class file.models.named_file.HasFiles[source]

Bases: Protocol

Base class for protocol classes.

Protocol classes are defined as:

class Proto(Protocol):
    def meth(self) -> int:

Such classes are primarily used with static type checkers that recognize structural subtyping (static duck-typing).

For example:

class C:
    def meth(self) -> int:
        return 0

def func(x: Proto) -> int:
    return x.meth()

func(C())  # Passes static type check

See PEP 544 for details. Protocol classes decorated with @typing.runtime_checkable act as simple-minded runtime protocols that check only the presence of given attributes, ignoring their type signatures. Protocol classes can be generic, they are defined as:

class GenProto(Protocol[T]):
    def meth(self) -> T:
files: sqlalchemy.orm.relationship[list[onegov.file.models.file.File]][source]
class file.models.named_file.NamedFile(cls: type[_F] | None = None)[source]

Helper for managing files using static names together with AssociatedFiles.

A named file can be added by assigning a tuple of a file-like content and a filename. Reading the named file will return a File object. Finally, named files can be deleted using the del-Operator.


class MyClass(AssociatedFiles):

pdf = NamedFile()

obj = MyClass() with open(‘some.pdf’, ‘rb’) as file:

obj.pdf = (, ‘some.pdf’) del obj.pdf

__set_name__(owner: type[object], name: str) None[source]
__get__(instance: None, owner: type[HasFiles] | None = None) typing_extensions.Self[source]
__get__(instance: HasFiles, owner: type[HasFiles] | None = None) onegov.file.models.file.File | None
__set__(instance: HasFiles, value: tuple[bytes | IO[bytes], str | None]) None[source]
__delete__(instance: HasFiles) None[source]