How to use the patchy.core.PatchModule function in patchy

if isinstance(target, str):
            target = resolve(target, package=self.target.__name__)
        if isinstance(source, str):
            source = resolve(source, package=self.source.__name__)

        elif source is None:
            # Deal with nested modules in a pack
            # Test for corresponding module relative to current source
            source_name = target.__name__.replace('.', self.module_sep)
            with suppress(ImportError):
                source = resolve(source_name, package=self.source.__name__)

        if isinstance(target, ModuleType):
            if source:
                logger.info('Patching {} using {}'.format(target.__name__, source.__name__))
            return PatchModule(target, source, self.module_sep)

def patchy(target, source=None):
    """ If source is not supplied, auto updates cannot be applied """
    if isinstance(target, str):
        target = resolve(target)
    if isinstance(source, str):
        source = resolve(source)
    if isinstance(target, ModuleType):
        return PatchModule(target, source)
    elif isinstance(target, type) and source:
        return PatchClass(target, source)