monkeypatching

问题 This question already has answers here : How to skip or ignore python decorators (3 answers) Closed 4 years ago . I have a decorator @auth which basically checks a database to ensure a user can access a given REST call. I would like to write some unit tests for these calls. My initial idea was to simply monkeypatch the decorator into a pass through that does nothing. (My initial idea failed, so I may just monkeypatch some function inside of @auth so that it always passes, but I'm still

问题 So I'm trying to monkey patch the onkey function in turtle so it calls a function with the button hit instead of just calling it with no arguments. I'm using the string "tester" to see if it works, but it looks like the original functions never got changes. Can someone explain what I'm doing wrong? from threading import Thread from time import sleep from turtle import * def NEWonkeypress(self, fun, key=None): if fun is None: if key in self._keys: self._keys.remove(key) elif key is not None

问题 I've changed attributes for other classes before without issues. _Element is obviously not a built-in. from lxml.etree import _Element _Element.new_attr = 54 results in: TypeError: can't set attributes of built-in/extension type 'lxml.etree._Element' 回答1: _Element is implemented in Cython. As Steve Holden explains (my emphasis), The problem is that extension types' attributes are determined by the layout of the object's slots and forever fixed in the C code that implements them: the slots can

问题 I don't seem to be able to monkey patch a __call__ method of class instance (and yes, I want to patch just single instances, not all of them). The following code: class A(object): def test(self): return "TEST" def __call__(self): return "EXAMPLE" a = A() print("call method: {0}".format(a.__call__)) print("test method: {0}".format(a.test)) a.__call__ = lambda : "example" a.test = lambda : "test" print("call method: {0}".format(a.__call__)) print("test method: {0}".format(a.test)) print(a())

问题 class Foo(object): pass foo = Foo() def bar(self): print 'bar' Foo.bar = bar foo.bar() #bar Coming from JavaScript, if a "class" prototype was augmented with a certain attribute. It is known that all instances of that "class" would have that attribute in its prototype chain, hence no modifications has to be done on any of its instances or "sub-classes". In that sense, how can a Class-based language like Python achieve Monkey patching? 回答1: The real question is, how can it not? In Python,

问题 class Foo(object): pass foo = Foo() def bar(self): print 'bar' Foo.bar = bar foo.bar() #bar Coming from JavaScript, if a "class" prototype was augmented with a certain attribute. It is known that all instances of that "class" would have that attribute in its prototype chain, hence no modifications has to be done on any of its instances or "sub-classes". In that sense, how can a Class-based language like Python achieve Monkey patching? 回答1: The real question is, how can it not? In Python,

问题 class Foo(object): pass foo = Foo() def bar(self): print 'bar' Foo.bar = bar foo.bar() #bar Coming from JavaScript, if a "class" prototype was augmented with a certain attribute. It is known that all instances of that "class" would have that attribute in its prototype chain, hence no modifications has to be done on any of its instances or "sub-classes". In that sense, how can a Class-based language like Python achieve Monkey patching? 回答1: The real question is, how can it not? In Python,

问题 If my library has a contrib extra that has dependencies in it (say requests ) that I want users to have to install to have access to a CLI API, but I install the contrib extra during my tests in CI how do I use pytest's MonkeyPatch to remove the dependencies during tests to ensure my detection is correct? For example, if the contrib extra will additionally install requests and so I want users to have to do $ python -m pip install mylib[contrib] to then be able to at the command line have a

问题 If my library has a contrib extra that has dependencies in it (say requests ) that I want users to have to install to have access to a CLI API, but I install the contrib extra during my tests in CI how do I use pytest's MonkeyPatch to remove the dependencies during tests to ensure my detection is correct? For example, if the contrib extra will additionally install requests and so I want users to have to do $ python -m pip install mylib[contrib] to then be able to at the command line have a

来源： https://stackoverflow.com/questions/27637653/how-to-test-an-infinite-while-loop-with-pytest