How to use the testinfra.modules function in testinfra

def _register_functions():
    """
    Iterate through the exposed Testinfra modules, convert them to salt
    functions, and then register them in the module namespace so that they
    can be called via salt.
    """
    try:
        modules_ = [_to_snake_case(module_) for module_ in modules.__all__]
    except AttributeError:
        modules_ = [module_ for module_ in modules.modules]

    for mod_name in modules_:
        mod_name = _to_snake_case(mod_name)
        mod_func = _copy_function(mod_name, str(mod_name))
        mod_func.__doc__ = _build_doc(mod_name)
        __all__.append(mod_name)
        globals()[mod_name] = mod_func

def _generate_functions():
    try:
        modules_ = [_to_snake_case(module_) for module_ in modules.__all__]
    except AttributeError:
        modules_ = [module_ for module_ in modules.modules]

    for module_name in modules_:
        func_name = 'testinfra.{0}'.format(module_name)
        __all__.append(module_name)
        log.debug('Generating state for module %s as function %s',
                  module_name, func_name)
        globals()[module_name] = _wrap_module_function(func_name)

def __getattr__(self, name):
        if name in testinfra.modules.modules:
            module_class = testinfra.modules.get_module_class(name)
            obj = module_class.get_module(self)
            setattr(self, name, obj)
            return obj
        raise AttributeError("'{}' object has no attribute '{}'".format(
            self.__class__.__name__, name))

def _register_functions():
    """
    Iterate through the exposed Testinfra modules, convert them to salt
    functions, and then register them in the module namespace so that they
    can be called via salt.
    """
    try:
        modules_ = [_to_snake_case(module_) for module_ in modules.__all__]
    except AttributeError:
        modules_ = [module_ for module_ in modules.modules]

    for mod_name in modules_:
        mod_name = _to_snake_case(mod_name)
        mod_func = _copy_function(mod_name, str(mod_name))
        mod_func.__doc__ = _build_doc(mod_name)
        __all__.append(mod_name)
        globals()[mod_name] = mod_func

def __getattr__(self, name):
        if name in testinfra.modules.modules:
            module_class = testinfra.modules.get_module_class(name)
            obj = module_class.get_module(self)
            setattr(self, name, obj)
            return obj
        raise AttributeError("'{}' object has no attribute '{}'".format(
            self.__class__.__name__, name))

def _generate_functions():
    try:
        modules_ = [_to_snake_case(module_) for module_ in modules.__all__]
    except AttributeError:
        modules_ = [module_ for module_ in modules.modules]

    for module_name in modules_:
        func_name = 'testinfra.{0}'.format(module_name)
        __all__.append(module_name)
        log.debug('Generating state for module %s as function %s',
                  module_name, func_name)
        globals()[module_name] = _wrap_module_function(func_name)