If monkey patching is permitted in both Ruby and Python, why is it more controversial in Ruby?

Question

In many discussions I have heard about Ruby in which people have expressed their reservations about the language, the issue of monkey patching comes up as one of their primary c

Answer 1

If you want to do some monkey patching in Python, it is relatively easy, as long as you are not modifying a built-in type (int, float, str).

class SomeClass:
    def foo(self):
        print "foo"

def tempfunc(self):
    print "bar"
SomeClass.bar = tempfunc
del tempfunc

This will add the bar method to SomeClass and even existing instances of that class can use that injected method.