Redesigning functions on the fly?

Question

Hi.
I was reading the decorators section when I found a section explaining that we could permanently change a function, like:
print_text = decorator(print_text)
Does this change permanently the function as on its code, or does this only happen locally like an anonymous function?
Thank you for your time.
Have a nice day. :)

Answer 1

the print_text function is changed permanently.
in fact look at the expression, is an assignement, so the left member change value according to the right member. In this case, print_text become the return value of decorators (arguments).
hope that makes sense for you :)

Answer 2

i don't know java, but if you can reassign a function you can do that with a wrapper(don't look at the syntax):

myfunc (){
print ('func')
}

otherfunc (){
wrapper (){
print ('modified')
myfunc ()
}
return wrapper
}

now:
otherfunc ()()

otuput:
func
modified

so:
myfunc = otherfunc ()

it hink not many languages permit to reassing the identifier of functions
speakong of application, probably you'll see while working, i really reccomend you to read code written be other developers(for ex: code of third party packages)
for example it can be useful for modify the implementation of a function without altering too much the existing code or much better example, modify a Written-By-Other function code for your needs

Answer 3

error

the output is:
modified
func

hope it helps :)

Answer 4

First, Thank you for the answer. Second, as a Java programmer redesigning a class or a method on the fly is not something I ever heard of. I mean, there is method overriding, anonymous classes (and now lambda), etc, but the original stays the same and it can be called and works as it was originally programmed.
So I can deduct that in python the methods (or functions in python) can be overriden and reassigned as the original, changing the function permanently. Am I correct? If yes, what are the pros of it? Could you give a concrete example?
Thank you for your time.
Have a nice day. :)