A bound method is the one which is dependent on the instance of the class as the first argument. It passes the instance as the first argument which is used to access the variables and functions. In Python 3 and newer versions of python, all functions in the class are by default bound methods.
Let’s understand this concept with an example:
# Python code to demonstrate # use of bound methods class A: def func(self, arg): self.arg = arg print("Value of arg = ", arg) # Creating an instance obj = A() # bound method print(obj.func)
Output:
< bound method A.func of <__main__.A object at 0x7fb81c5a09e8>>
Here,
obj.func(arg) is translated by python as A.func(obj, arg).
The instance obj
is automatically passed as the first argument to the function called and hence the first parameter of the function will be used to access the variables/functions of the object.
Let’s see another example of the Bound method.
# Python code to demonstrate # use of bound methods class Car: # Car class created gears = 5 # a class method to change the number of gears @classmethod def change_gears(cls, gears): cls.gears = gears # instance of class Car created Car1 = Car() print("Car1 gears before calling change_gears() = ", Car1.gears) Car1.change_gears(6) print("Gears after calling change_gears() = ", Car1.gears) # bound method print(Car1.change_gears)
Output:
Car1 gears before calling change_gears() = 5 Gears after calling change_gears() = 6 >
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