Python3 @Property.setter and Object have no properties

I’m learning objects using Python with the second edition of “The Quick Python Book”. I’m using Python 3

I’m trying to understand the @property and the setter for that property.
From page 199, chapter 15, I tried this example and got an error :

>>> class Temparature:
    def __init__(self):
        self._temp_fahr = 0
        @property
        def temp(self):
            return (self._temp_fahr - 32) * 5/9
        @temp.setter
        def temp(self, new_temp):
            self._temp_fahr = new_temp * 9 / 5 + 32

>>> t.temp
Traceback (most recent call last):
  File "<pyshell#22>", line 1, in <module>
    t.temp
AttributeError: 'Temparature' object has no attribute 'temp'
>>> 

Why does this error occur? Also, why can’t I just set the instance variable new_temp with function calls and parameters, for example:

t = Temparature()
t.temp(34)

Replace

t.temp = 43

You have defined all the methods in the __init__ method! Cancel indentation like this:

class Temparature:
    def __init__(self):
        self._temp_fahr = 0

@property
    def temp(self):
        return (self._temp_fahr - 32) * 5/9
    @temp.setter
    def temp(self, new_temp):
        self._temp_fahr = new_temp * 9 / 5 + 32

This

t.temp(34)

Does not work because the attributes are descriptors in this case they have a lookup priority, so t.temp returns what you defined @property。