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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _init():
 """Dynamically import engines that initialize successfully."""

    import importlib
    import os
    import re

    filenames = os.listdir(os.path.dirname(__file__))

    module_names = set()
    for filename in filenames:
        match = re.match(r'^(?P<name>[A-Z_a-z]\w*)\.py[co]?$', filename)
        if match:
            module_names.add(match.group('name'))

    for module_name in module_names:
        try:
            module = importlib.import_module('.' + module_name, __name__)
        except ImportError:
            continue

        for name, member in module.__dict__.items():
            if not isinstance(member, type):
                # skip non-new-style classes
                continue
            if not issubclass(member, Engine):
                # skip non-subclasses of Engine
                continue
            if member is Engine:
                # skip "abstract" class Engine
                continue

            try:
                handle = member.handle
            except AttributeError:
                continue

            engines[handle] = member