Sage-Tips

What is the use of monkey patching?

A monkey patch is a way to change, extend, or modify a library, plugin, or supporting system software locally. This means applying a monkey patch to a 3rd party library will not change the library itself but only the local copy of the library you have on your machine.

What is meant by monkey patching in Python?

In Python, the term monkey patch refers to dynamic (or run-time) modifications of a class or module. In Python, we can actually change the behavior of code at run-time.

Is monkey patching bad?

But you should never consider this a standard technique and build monkey patch upon monkey patch. This is considered bad because it means that an object’s definition does not completely or accurately describe how it actually behaves.

Is monkey patching a good idea?

Monkey patching is good for testing or mocking out behavior. They can be localized in factory/class decorators/metaclasses where they create a patched new class/object from another object to help with “cross-cutting concerns” in between ALL methods like logging/memoization/caching/database/persistance/unit conversion.

What is Monkey patching how do you use it in python example is it ever a good idea?

Monkey patching can only be done in dynamic languages, of which python is a good example. In Monkey patching, we reopen the existing classes or methods in class at runtime and alters the behavior, which should be used cautiously, or you should use it only when you really need to.

What is Monkey patching in Java?

“Monkey patching” in the literal sense that it is used in Ruby (i.e. “replace methods of a class at runtime”, see e.g. [1]) is possible with “Java Agents” and the “retransform” API, but it’s much harder than it is in Ruby.

Why is it called Monkey patching?

The term monkey patch seems to have come from an earlier term, guerrilla patch, which referred to changing code sneakily – and possibly incompatibly with other such patches – at runtime. The word guerrilla, homophonous with gorilla (or nearly so), became monkey, possibly to make the patch sound less intimidating.

What is Monkey patching how do you use it in Python example is it ever a good idea?

Why is it called monkey patching?

What is a patch in Python?

The Python mock object library is unittest. mock . The library also provides a function, called patch() , which replaces the real objects in your code with Mock instances. You can use patch() as either a decorator or a context manager, giving you control over the scope in which the object will be mocked.

Is monkey patching metaprogramming?

Metaprogramming. Monkey patching is the first step towards meta-programming – writing code which writes code. More on this soon.

Is Monkey patching metaprogramming?

What is monmonkey patching?

Monkey patching is a technique used to dynamically update the behavior of a piece of code at run-time. Why use monkey patching? It allows us to modify or extend the behavior of libraries, modules, classes or methods at runtime without actually modifying the source code

What is a monkeypatch in Python?

A MonkeyPatch is a piece of Python code which extends or modifies other code at runtime (typically at startup). A simple example looks like this: from SomeOtherProduct.SomeModule import SomeClass def speak (self): return “ook ook eee eee eee!”

What happens when two modules attempt to monkey patch the same method?

If two modules attempt to monkey patch the same method, one of them (whichever one runs last) “wins” and the other patch has no effect, unless monkey patches are written with a pattern like alias_method_chain.

Does get_data() call the monkey-patched replacement in test cases?

If anything else besides your test logic calls get_dataas well, it will also call your monkey-patched replacement rather than the original — which can be good or bad. Just beware.