Dynamically adding methods to objects in Python

Posted by Codehead on November 5, 2008 at 7:18 am · Under Python

The trick is that you have to add the function to the class not the instance to see how, run your interpreter and write these:

class test:
	def __init__(self):
		self.yes = "Hello Python!"
 
def a(self):
	print self.yes
 
t = test()
t.b = a
t.b()

When this runs, you get:

Traceback (most recent call last):
File “ “, line 1, in
t.b()
TypeError: b() takes exactly 1 argument (0 given)

To fix this, you will have to assign the function a to the class itself (test) not the instance (t) like:

test.b = a
t = test()
t.b()

Python is fun :)

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