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<h3>Python property() function</h3>

<p>In Python, the main purpose of Property() function is to create property of a class. <br>

Syntax:

property(fget, fset, fdel, doc)

If no arguments are given, property() method returns a base property attribute that doesn’t contain any getter, setter or deleter.

If doc isn’t provided, property() method takes the docstring of the getter function.

Parameters: <br>

fget() – used to get the value of attribute <br>

fset() – used to set the value of attribute <br>

fdel() – used to delete the attribute value <br>

doc() – string that contains the documentation (docstring) for the attribute <br>

Return: Returns a property attribute from the given getter, setter and deleter <br>

If no arguments are given, property() method returns a base property attribute that doesn’t contain any getter, setter or deleter. <br>

If doc isn’t provided, property() method takes the docstring of the getter function. <br>

<b>Example:</b>

# Python program to explain property() function

# Alphabet class

class Alphabet:

def __init__(self, value):

self._value = value

# getting the values

def getValue(self):

print('Getting value')

return self._value

# setting the values

def setValue(self, value):

print('Setting value to ' + value)

self._value = value

# deleting the values

def delValue(self):

print('Deleting value')

del self._value

value = property(getValue, setValue, delValue, )

# passing the value

x = Alphabet('CODEMISTIC')

print(x.value)

x.value = 'CM'

del x.value

<b>Output:</b>

Getting value

CODEMISTIC

Setting value to CM

Deleting value

<b>Using Decorator: </b><br>

The main work of decorators is they are used to add functionality to the existing code. Also called metaprogramming, as a part of the program tries to modify another part of the program at compile time. <br>

<b>Example: Using @property decorator</b>

# Python program to explain property()

# function using decorator

class Alphabet:

def __init__(self, value):

self._value = value

# getting the values

@property

def value(self):

print('Getting value')

return self._value

# setting the values

@value.setter

def value(self, value):

print('Setting value to ' + value)

self._value = value

# deleting the values

@value.deleter

def value(self):

print('Deleting value')

del self._value

# passing the value

x = Alphabet('Peter')

print(x.value)

x.value = 'Diesel'

del x.value

<b>Output:</b>

Getting value

Peter

Setting value to Diesel

Deleting value

<b>Applications:</b> <br>

By using property() method, we can modify our class and implement the value constraint without any change required to the client code. So that the implementation is backward compatible.</p>

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