CODEWITHSUNDEEP
python
Kurt Peek
Kurt Peek

Reputation: 57421

property not working as intended

I'm trying to follow a tutorial on http://www.programiz.com/python-programming/property, and have written the following script:

class Celsius:
    def __init__(self, temperature = 0):
        self.temperature = temperature

    def get_temperature(self):
        print("Getting value")
        return self._temperature

    def set_temperature(self, value):
        if value < -273:
            raise ValueError("Temperature below -273 is not possible")
        print("Setting value")
        self._temperature = value

    temperature = property(get_temperature, set_temperature)


c = Celsius()

print c.temperature
c.temperature = 100
print c.temperature

When I run the script, I simply see the two temperature values:

0
100

However, I would expect the Getting value and Setting value print statements to be visible as well. Is the property somehow not working properly?

Upvotes: 1

Views: 102

Answers (3)

Howardyan
Howardyan

Reputation: 657

you need define class as this:

class Celsius(object):
    balabala
    balabala

Upvotes: 1

Moses Koledoye
Moses Koledoye

Reputation: 78546

The code should work as is, but you're mixing Python 2 syntax with Python 3.

If you turn the print statements outside the class into function calls, the code works fine as valid Python 3.

If you'll run this as Python 2 code, then you have to inherit your class from object and keep every other thing as is.

Choose one.

Upvotes: 1

khelwood
khelwood

Reputation: 59093

What you're trying to do only works in new-style classes. To declare a new-style class in Python 2, you need to have

class Celsius(object):

instead of

class Celsius:

In Python 3, all classes are new-style, so the plain class Celsius works fine.

Upvotes: 2

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