scoped-context 0.0.1.dev1

Use contexts (`with` statements) to manage scopes.

scoped-context

scoped-context helps manage scopes using context managers in Python.

Usage

Get the context stack and current context of a specific class:

from scoped_context import ScopedContext

class A(ScopedContext):
    pass

with A() as a1:
    print(A.context_stack())  # -> `[a1]`
    print(A.current())  # -> `a1`

    with A() as a2:
        print(A.context_stack())  # -> `[a1, a2]`
        print(A.current())  # -> `a2`

    print(A.context_stack())  # -> `[a1]`
    print(A.current())  # -> `a1`

print(A.context_stack())  # -> `[]`
print(A.current())  # -> raises scoped_context.NoContextError

You can mix different subclasses of ScopedContext, and access the class-wide context:

from scoped_context import ScopedContext, get_current_context, get_context_stack

class A(ScopedContext):
    pass

class B(ScopedContext):
    pass

class C(ScopedContext):
    pass

with A() as a1:
    with B() as b1:
        with C() as c1:
            # class-wide context
            print(get_context_stack())  # -> `[a1, b1, c1]`
            print(get_current_context())  # -> `c1`

            # You can specify classes (recommended)
            print(get_context_stack((A, B)))  # -> `[a1, b1]`
            print(get_current_context((A, B)))  # -> `b1`

            # class-specific context
            print(A.context_stack())  # -> `[a1]`
            print(A.current())  # -> `a1`
            print(B.context_stack())  # -> `[b1]`
            print(B.current())  # -> `b1`
            print(C.context_stack())  # -> `[c1]`
            print(C.current())  # -> `c1`