Python Forum

Hi all. I don't know from where "None" come. Of course I should like to get rid of them.

class FirstClass:
	def setdata(self, value):
		self.data=value		
	def display(self):
		print(self.data)
		
x=FirstClass()
y=FirstClass()
x.setdata("King Arthur")
y.setdata(3.14159)
print(x.display())     #King Arthur
print(y.display())     #3.14159
x.data="Age of King Arthur"
print(x.display())     #Age of King Arthur
x.anotherInteger=67
print(x.anotherInteger)   # 67

And now the Output

Output:
λ python class1.py 
King Arthur        
None               
3.14159            
None               
Age of King Arthur 
None               
67                 

You get None printed because FirstClass.display function does not return anything so it does return the default None.
In your code you print from within the function, so there is no need to print again when calling the function, e.g.
replace print(x.display()) with just x.display()