Help with Classes

[buran]

You don't need the for loops when you generate x and y. With your code you will generate 11 x values and 29 y values, but at the end you will add just the last pair - 11th x and 29th y, all other are lost. see for yourself

a=[]
for j in range(11):
      x=random.randint(1,12)
      print('x={}'.format(x))
for i in range(29):
      y=random.randint(1,29)
      print('y={}'.format(y))
a.append((x,y))
print(a)

note that you need extra pair of brackets for the append.
when you get the x and y, you don't want to add them to list. you want to create instance of Triangle or Sphere class and use x and y when create that instance

the second snippet - it even doesn't run. Please, pay more attention.