Instances in classes

[dannyH]

When I create 2 instances of a class and modify one, the other also gets modified. What am I doing wrong?

class superGrid:
    
    def __init__(self, square, size = 10):
        self.square =  square
        self.size = size
        
    def shuffle(self):
        self.square[3][7] = '#'
        
    def printGridSquare(self):
        print self.square[3][7]
    
class gridSquare(superGrid):
    new = 10*[10*['0']]
    
    size1 = len(new)
    def __init__(self, size = size1, square = new):
        self.square =  square
        self.size = size
        
# Create an instance of the grid square:
g = gridSquare()
s = gridSquare()
g.printGridSquare()
s.printGridSquare()
g.shuffle()
g.printGridSquare()
s.printGridSquare()