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Question

# second class
class Phone:

def add_color(self,color):
self.color = color

def add_cost(self,cost):
self.cost = cost

def show_color(self):
return color

def show_cost(self):
return cost

p3=Phone()
p3.add_color("blue")
p3.show_color()

Answer 1

missing self in return statement:
return self.color
return self.cost

And missing print for output:
print(p3.show_color())

And wrong indentation. The last 3 lines belong all the way to the left.

Answer 2

thank you @coding at, I am new in python . I will use it in data analysis and machine learning

Answer 3

Your class has no constructor (__init__() function).

Answer 4

Yes Simon Sauter you are right. But if you create a class without a constructor, Python automatically creates the default constructor for you. That doesn’t do anything. I think it's not an issue for a simple example like this.