from box import Box, singleton, threadlocal

box = Box()
box.put('wow', factory=create_wow, scope=my_scope_fn)
box.put('foo', factory=create_foo, scope=singleton)
box.put('bar', 42)


@box.pass('foo')            # lazy passing
@box.pass('bar', as='b')    # lazy passing
def do_something(a, b):
    return a + b


box.get('bar')

do_something()
do_something(13)
do_something(13, 42)

# ------------
# ------------

# without populated box

do_something()          # exception
do_something(13)        # exception
do_something(13, 42)    # works as everything explicitly passed

box.get('bar')          # keyerror exception


# ------------
# ------------

from box import current_box

# the technique is similiar to flask

@current_box.pass('foo')
def do_something(foo):
    return foo


box1 = Box()
box2 = Box()

box1.put('foo', 'a')
box2.put('foo', 'b')

with box1:
    do_something() # -> a
    with box2:
        do_something() # -> b