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"""
transitions.extensions
----------------------
Additional functionality such as hierarchical (nested) machine support, Graphviz-based diagram creation
and threadsafe execution of machine methods. Additionally, combinations of all those features are possible
and made easier to access with a convenience factory.
"""
from .diagrams import GraphMachine, HierarchicalGraphMachine
from .nesting import HierarchicalMachine
from .locking import LockedMachine
from .factory import MachineFactory, LockedHierarchicalGraphMachine
from .factory import LockedHierarchicalMachine, LockedGraphMachine
try:
# only available for Python 3
from .asyncio import AsyncMachine, HierarchicalAsyncMachine
from .factory import AsyncGraphMachine, HierarchicalAsyncGraphMachine
except (ImportError, SyntaxError): # pragma: no cover
pass
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