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How to use my_singleton method in localstack

Best Python code snippet using localstack_python

test_objects.py

Source:test_objects.py

...30    def test_call_and_clear(self):31        mock = MagicMock()32        mock.return_value = "foobar"33        @singleton_factory34        def my_singleton():35            return mock()36        assert my_singleton() == mock.return_value37        mock.assert_called_once()38        assert my_singleton() == mock.return_value39        mock.assert_called_once()40        my_singleton.clear()41        assert my_singleton() == mock.return_value42        mock.assert_has_calls([(), ()])43        assert my_singleton() == mock.return_value44        mock.assert_has_calls([(), ()])45    def test_exception_does_not_set_a_value(self):46        mock = MagicMock()47        @singleton_factory48        def my_singleton():49            mock()50            raise ValueError("oh noes")51        with pytest.raises(ValueError):52            my_singleton()53        mock.assert_has_calls([()])54        with pytest.raises(ValueError):55            my_singleton()56        mock.assert_has_calls([(), ()])57    def test_set_none_value_does_not_set_singleton(self):58        mock = MagicMock()59        mock.return_value = None60        @singleton_factory61        def my_singleton():62            return mock()63        assert my_singleton() is None64        mock.assert_has_calls([()])65        assert my_singleton() is None66        mock.assert_has_calls([(), ()])67    def test_set_falsy_value_sets_singleton(self):68        mock = MagicMock()69        mock.return_value = False70        @singleton_factory71        def my_singleton():72            return mock()73        assert my_singleton() is False74        mock.assert_called_once()75        assert my_singleton() is False...

8_singleton.py

Source:8_singleton.py

1"""Implements a singleton design pattern in Python."""2import functools3# from https://realpython.com/primer-on-python-decorators/#creating-singletons4def singleton(cls):5    """make a class a singleton class (only one instance)"""6    @functools.wraps(cls)7    def wrapper_singleton(*args, **kwargs):     # this is the decoration which checks for previous existence8        if not wrapper_singleton.instance:9            wrapper_singleton.instance = cls(*args, **kwargs)10            print("in decoration: no instance exists, so let's create one!")11        else:12            print("in decoration: instance already exists!")13        return wrapper_singleton.instance14    wrapper_singleton.instance = None15    return wrapper_singleton            # return instance of class, rather than function with other decorators16@singleton17class MySingleton:18    def __init__(self, parameter):19        self.parameter = parameter20    def do_some_stuff(self):21        print("parameter =", self.parameter)22print("\ncreate a MySingleton...")23my_singleton = MySingleton('my_parameter_string')       # MySingleton is really wrapper_singleton(MySingleton)24print("singleton at", id(my_singleton))25print("type(my_singleton) =", type(my_singleton))       # ..which returns a MySingleton instance26my_singleton.do_some_stuff()27print("\ncreate a another MySingleton...")28my_singleton_copy = MySingleton('my_other_parameter_string')       # this is wrapper_singleton(MySingleton)29print("singleton at", id(my_singleton_copy))...

singlegon.py

Source:singlegon.py

1#!/usr/bin/env python2# -*- coding:utf-8 -*-3class Singleton1(object):4    """å®ç°æ¹å¼1ï¼ä½¿ç¨__new__"""5    def __new__(cls, *args, **kwargs):6        if not hasattr(cls, '_instance'):7            orig = super(Singleton1, cls)8            cls._instance = orig.__new__(cls, *args, **kwargs)9        return cls._instance10class Singleton2(object):11    """åå»ºå®ä¾æææå®ä¾ç__dict__é½æååä¸ä¸ªåå¸ï¼ä½¿å·æç¸åçå±æ§åæ¹æ³12    ä¼ªåä¾13    """14    _state = {}15    def __new__(cls, *args, **kwargs):16        ob = super(Singleton2, cls).__new__(cls, *args, **kwargs)17        ob.__dict__ = cls._state18        return ob19def Singleton3(cls, *args, **kwargs):20    """è£é¥°å¨çæ¬çåä¾"""21    instances = {}22    def getinstance():23        if cls not in instances:24            instances[cls] = cls(*args, **kwargs)25        return instances[cls]26    return getinstance27@Singleton328class Singleton(object):29    pass30'''31# æ¹æ³4ï¼ä½ä¸ºpythonçæ¨¡åæ¯å¤©ç¶çåä¾æ¨¡å¼32# mysingleton.py33class My_Singleton(object):34    def foo(self):35        pass36my_singleton = My_Singleton()37# to use38from mysingleton import my_singleton39my_singleton.foo()40'''41def test_singleton():42    """use py.test for unit test"""43    s1 = Singleton()44    s2 = Singleton()45    assert id(s1) == id(s2)...

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