adding the property decorator

Author: rubada

04.Built-in_decorators_for_classes/01.Built-in_decorators_for_classes_scripts/05b.property_as_decorator.py

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+# "property" decorator
+# "property" decorator is a built-in decorator in Python which is helpful in
+# defining the properties without manually calling the built-in
+# function property(). The decorator allows you to create a property object or
+# attribute of a class, same as the "property()"
+# The difference is that the methods that have the property function as a
+# decorator will not be protected members because the methods that have the
+# getter decorator will be called from outside the class.
+
+class TemperatureConvertor:
+
+    """Fahrenheit to Celsius"""
+    # 1. Add the property decorator on the get function:
+    @property
+    def temp_get_fahrenheit(self):
+        """Get the temperature in Fahrenheit"""
+        return self._fahrenheit
+
+    # 2. Define the setter decorator, we can keep the same name as the
+    # get function.
+    @temp_get_fahrenheit.setter
+    def temp_set_fahrenheit(self, fahrenheit):
+        """Set the temperature in Fahrenheit"""
+        self._fahrenheit = fahrenheit
+
+    # 3. We can add a deleter function
+    @temp_get_fahrenheit.deleter
+    def temp_del_fahrenheit(self):
+        del self._fahrenheit
+
+    def convert_to_celsius(self):
+        celsius = (self._fahrenheit - 32) * 5/9
+        print(f"The {self._fahrenheit}°F is:")
+        return f"{round(celsius, 0)}°C"
+
+    """Celsius to Fahrenheit"""
+    @property
+    def temp_get_celsius(self):
+        """Get the temperature in Celsius"""
+        return self._celsius
+
+    @temp_get_celsius.setter
+    def temp_set_celsius(self, celsius):
+        """Set the temperature in Celsius"""
+        self._celsius = celsius
+
+    @temp_get_celsius.deleter
+    def temp_del_celsius(self):
+        del self._celsius
+
+    def convert_to_fahrenheit(self):
+        fahrenheit = self._celsius * 9/5 + 32
+        print(f"The {self._celsius}°C is:")
+        return f"{round(fahrenheit, 0)}°F"
+
+
+# Creating an instance of the the class
+temp = TemperatureConvertor()
+
+# celsius_or_fahrenheit = input("Choose C or F: ")
+# if celsius_or_fahrenheit == "F":
+#     fahrenheit = float(input("Insert temperature in Fahrenheit: "))
+#     temp.temp_set_fahrenheit = fahrenheit
+#     print(temp.convert_to_celsius())
+
+# elif celsius_or_fahrenheit == "C":
+#     celsius = float(input("Insert temperature in Celsius: "))
+#     temp.temp_set_celsius = celsius
+#     print(temp.convert_to_fahrenheit())
+
+# else:
+#     print("Wrong input, please insert C or F in capital letters")
+
+
+temp.temp_set_celsius = 90
+# print(temp.convert_to_fahrenheit())
+
+# Get the property:
+# print(temp.temp_get_celsius)
+
+# Deleting the property:
+del temp.temp_del_celsius
+# print(temp.temp_get_celsius)
+
+# If we try and print the attribute, it will give an AttributeError,
+# saying that 'TemperatureConvertor' object has no attribute '_celsius'
+
+
+# Final note in the above example, we didn't use the __init__(), but if your
+# code needs to add public attributes you can use the __init__, also you can
+# use these attributes with the property function if needed.