How I can create reference to member of the class instance?

[buran]

Still not sure if I understand, but is it this

class Cycler(object):
    def __init__(self, data):
        self.data = data
        
    def increase(self, value):
        self.data += value
        
# create instance of class Cycler        
cycler = Cycler(2)

#access instance property data
print(cycler.data)

#change instance property data
cycler.increase(3)

#access instance property data again
print(cycler.data)

You access members (properties and methods) using self. self being used to reference the instance is just a convention.