Differences between class and instance variables in Python

object_variables_example.py

class Test1InstanceVariable:
    mylist=[]
    
    def __init__(self, number):
        self.number= number
        
    def add(self, i):
        self.mylist.append(i)

    def show(self):
        print "[test %d] list=%s" % (self.number, " ".join(self.mylist))

class Test2ClassVariable:
    mylist=[]
    
    def __init__(self, number):
        self.number= number
        self.mylist=[]
        
    def add(self, i):
        self.mylist.append(i)

    def show(self):
        print "[test %d] list=%s" % (self.number, " ".join(self.mylist))

        
if __name__ == '__main__':
    
    t1=Test1InstanceVariable(1)
    t1.add('one')
    t1.show()
    
    t1=Test1InstanceVariable(2)
    t1.add('two')
    t1.show()

    
    t1=Test2ClassVariable(3)
    t1.add('three')
    t1.show()
    
    t1=Test2ClassVariable(4)
    t1.add('four')
    t1.show()