How Can I create class if i have to create object for my class like below.
Obj1 = Class()
Obj2 = Class(para1,para2,para3)
This is related to a task that i need to complete just started learning Python.
I tried construction overloading but it seems to not work in Python .Can anyone tell me how can i achieve this or it is technically wrong to have both line in one code.
You can use *args or **kwargs
class Class1:
def __init__(self, *args):
pass
obj1 = Class1()
obj2 = Class1(para1,para2,para3)
or
class Class1:
def __init__(self, **kwargs):
pass
obj1 = Class1()
obj2 = Class1(para1=para1,para2=para2,para3=para3)
Refer this to learn more about *args and **kwargs
If you set default values like length = 80, you don't have to set them. But if you set the values, it ll be set as you wish. The following code demonstrates almost what you want.
class Rectangle:
def __init__(self, length = 80, breadth = 60, unit_cost=100):
self.length = length
self.breadth = breadth
self.unit_cost = unit_cost
def get_perimeter(self):
return 2 * (self.length + self.breadth)
def get_area(self):
return self.length * self.breadth
def calculate_cost(self):
area = self.get_area()
return area * self.unit_cost
# r = Rectangle() <- this returns with default values
# breadth = 120 cm, length = 160 cm, 1 cm^2 = Rs 2000
r = Rectangle(160, 120, 2000)
print("Area of Rectangle: %s cm^2" % (r.get_area()))
print("Cost of rectangular field: Rs. %s " %(r.calculate_cost()))
def __init__(para1=None, para2=None, para3=None)whereNonecan be any default value. See docs.python.org/3/reference/… for details!