sampleclass.py

class BigBadClass:
    def __init__(self):
        #this is normally where you get stuff that gets set up when you initialize the class
        self.pants = "jorts"

    def changepants(self, newpants):
        # you can change the pants!
        self.pants = newpants

#initialize the class
pantc = BigBadClass()
print(pantc.pants)
pantc.changepants("bellbottoms")
print(pantc.pants)