Example of a very basic class.

SimpleClass.py

class myClass(object):
    def __init__(self, myInt):
        self.myString = "Hello"
        self.myInt = myInt

    def foo(self):
        self.myString = self.myString + " world."

    def add(self, n):
        self.myInt += n

myInstance = myClass(3)

print(myInstance.myString)
myInstance.foo()
print(myInstance.myString)
print()
print(myInstance.myInt)
myInstance.add(4)
print(myInstance.myInt)