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Completed the about_monkey_patching koan #24

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Completed the about_monkey_patching koan #24

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12 changes: 6 additions & 6 deletions python2/koans/about_monkey_patching.py
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Original file line number Diff line number Diff line change
Expand Up @@ -15,7 +15,7 @@ def bark(self):

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Are you familiar with the concept of Monkey Patching? Could you briefly explain what it is and give an example of what it is used for?

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I have an understanding of what is, but I'm not that familiar with it.

What I get of Monkey Patching is a way to modify classes to add functionalities according to what you desire for that specific code.

For example, you may be importing a class from another source, but for that specific code you need some kind of test to validate a variable, so instead of creating an object to handle that testing, you just add it to the imported class, and that would be valid for that code.

def test_as_defined_dogs_do_bark(self):
fido = self.Dog()
self.assertEqual(__, fido.bark())
self.assertEqual("WOOF", fido.bark())

# ------------------------------------------------------------------

Expand All @@ -27,16 +27,16 @@ def wag(self):
self.Dog.wag = wag

fido = self.Dog()
self.assertEqual(__, fido.wag())
self.assertEqual(__, fido.bark())
self.assertEqual("HAPPY", fido.wag())
self.assertEqual("WOOF", fido.bark())

# ------------------------------------------------------------------

def test_most_built_in_classes_cannot_be_monkey_patched(self):
try:
int.is_even = lambda self: (self % 2) == 0
except StandardError as ex:
self.assertMatch(__, ex[0])
self.assertMatch("can't set attributes of built-in/extension type 'int'", ex[0])

# ------------------------------------------------------------------

Expand All @@ -46,5 +46,5 @@ class MyInt(int):
def test_subclasses_of_built_in_classes_can_be_be_monkey_patched(self):
self.MyInt.is_even = lambda self: (self % 2) == 0

self.assertEqual(____, self.MyInt(1).is_even())
self.assertEqual(____, self.MyInt(2).is_even())
self.assertEqual(False, self.MyInt(1).is_even())
self.assertEqual(True, self.MyInt(2).is_even())