what i don't understand about the setter property in python based on the example is, how do we decide what the value is?

Question

pineapple_allowed was given as False at the beginning, then as True at the end. How did the setter selct True as equal to value?

Answer 1

Please include your code in the post, thanks.

Answer 2

Q: How did the setter select True as equal to value?

A: The setter accepts True from this property assignment call, you assigned True for the property by calling this:

pizza.pineapple_allowed = True

Suggestion:

1) The code for setter is currently only working (executed) if you assigned True, because of the "if value:" check. If you assign the setter with False none of the code will be executed.

2) Since the property assignment is supposed to be password protected, I suggest you to ask for password first, then, if password is correct you decide the next step.

algo:
ask password
if correct password
allow property value change
else
intruder alert

Hth, cmiiw

Answer 3

It's this line under the class declaration code that exactly made changes to the pineapple_allowed property:

pizza.pineapple_allowed = True <- Argument

It invokes the pineapple_allowed setter passing True as argument for the property's value parameter (the setter "value" parameter becomes True)

The setter receives the new "value", and since you passed True; it asks for password, after you enter the right password the setter adjusts self._pineapple_allowed to True, because True was what you passed as argument.

To test this theory you can change:

pizza.pineapple_allowed = True

into

pizza.pineapple_allowed = False

Then see if at the end what the pineapple_allowed will return.

Hth,

Answer 4

This is the code associated with my question
class Pizza:
def __init__(self, toppings):
self.toppings = toppings
self._pineapple_allowed = False

@property
def pineapple_allowed(self):
return self._pineapple_allowed

@pineapple_allowed.setter
def pineapple_allowed(self, value):
if value:
password = input("Enter the password: ")
if password == "Sw0rdf1sh!":
self._pineapple_allowed = value
else:
raise ValueError("Alert! Intruder!")

pizza = Pizza(["cheese", "tomato"])
print(pizza.pineapple_allowed)
pizza.pineapple_allowed = True
print(pizza.pineapple_allowed)

OUTPUT

False
Enter the password: Sw0rdf1sh
True

Answer 5

Thanks for explaining, but I don't think you've addressed the point of my question.

At the beginning of the code
self._pineapple_allowed = False

In the property definition
def pineapple_allowed(self), returns self._pineapple_allowed.

In the setter block it is indicated that if password == Sw0rdf1sh!:
self._pineapple_allowed = value

Then at the end of the code
pizza.pineapple_allowed(which should be the same as self.pineapple_allowed) is = True

Why does the output print False then after evaluating the password decide that it is True?

That's what I'm asking, what exactly made it change from False to True?