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Dir : ~/lib/python3/dist-packages/automat/

Edit File: _discover.py

import collections
import inspect
from automat import MethodicalMachine
from twisted.python.modules import PythonModule, getModule

def isOriginalLocation(attr):
    """
    Attempt to discover if this appearance of a PythonAttribute
    representing a class refers to the module where that class was
    defined.
    """
    sourceModule = inspect.getmodule(attr.load())
    if sourceModule is None:
        return False

currentModule = attr
    while not isinstance(currentModule, PythonModule):
        currentModule = currentModule.onObject

return currentModule.name == sourceModule.__name__

def findMachinesViaWrapper(within):
    """
    Recursively yield L{MethodicalMachine}s and their FQPNs within a
    L{PythonModule} or a L{twisted.python.modules.PythonAttribute}
    wrapper object.

Note that L{PythonModule}s may refer to packages, as well.

The discovery heuristic considers L{MethodicalMachine} instances
    that are module-level attributes or class-level attributes
    accessible from module scope.  Machines inside nested classes will
    be discovered, but those returned from functions or methods will not be.

@type within: L{PythonModule} or L{twisted.python.modules.PythonAttribute}
    @param within: Where to start the search.

@return: a generator which yields FQPN, L{MethodicalMachine} pairs.
    """
    queue = collections.deque([within])
    visited = set()

while queue:
        attr = queue.pop()
        value = attr.load()

if isinstance(value, MethodicalMachine) and value not in visited:
            visited.add(value)
            yield attr.name, value
        elif (inspect.isclass(value) and isOriginalLocation(attr) and
              value not in visited):
            visited.add(value)
            queue.extendleft(attr.iterAttributes())
        elif isinstance(attr, PythonModule) and value not in visited:
            visited.add(value)
            queue.extendleft(attr.iterAttributes())
            queue.extendleft(attr.iterModules())

class InvalidFQPN(Exception):
    """
    The given FQPN was not a dot-separated list of Python objects.
    """

class NoModule(InvalidFQPN):
    """
    A prefix of the FQPN was not an importable module or package.
    """

class NoObject(InvalidFQPN):
    """
    A suffix of the FQPN was not an accessible object
    """

def wrapFQPN(fqpn):
    """
    Given an FQPN, retrieve the object via the global Python module
    namespace and wrap it with a L{PythonModule} or a
    L{twisted.python.modules.PythonAttribute}.
    """
    # largely cribbed from t.p.reflect.namedAny

if not fqpn:
        raise InvalidFQPN("FQPN was empty")

components = collections.deque(fqpn.split('.'))

if '' in components:
        raise InvalidFQPN(
            "name must be a string giving a '.'-separated list of Python "
            "identifiers, not %r" % (fqpn,))

component = components.popleft()
    try:
        module = getModule(component)
    except KeyError:
        raise NoModule(component)

# find the bottom-most module
    while components:
        component = components.popleft()
        try:
            module = module[component]
        except KeyError:
            components.appendleft(component)
            break
        else:
            module.load()
    else:
        return module

# find the bottom-most attribute
    attribute = module
    for component in components:
        try:
            attribute = next(child for child in attribute.iterAttributes()
                             if child.name.rsplit('.', 1)[-1] == component)
        except StopIteration:
            raise NoObject('{}.{}'.format(attribute.name, component))

return attribute

def findMachines(fqpn):
    """
    Recursively yield L{MethodicalMachine}s and their FQPNs in and
    under the a Python object specified by an FQPN.

The discovery heuristic considers L{MethodicalMachine} instances
    that are module-level attributes or class-level attributes
    accessible from module scope.  Machines inside nested classes will
    be discovered, but those returned from functions or methods will not be.

@type within: an FQPN
    @param within: Where to start the search.

@return: a generator which yields FQPN, L{MethodicalMachine} pairs.
    """
    return findMachinesViaWrapper(wrapFQPN(fqpn))