how to use variable from another function in python

1def fun1():
2    fun1.var = 100
3    print(fun1.var)
4
5def fun2():
6    print(fun1.var)
7
8fun1()
9fun2()
10
11print(fun1.var)
12

1s = Spam()
2s.oneFunction(lists)
3s.anotherFunction()
4

1>>> def oneFunction(lists):
2        category=random.choice(list(lists.keys()))
3        return random.choice(lists[category])
4
5
6>>> def anotherFunction():
7        for letter in oneFunction(lists):              
8        print("_",end=" ")
9

1class Spam:
2    def oneFunction(self,lists):
3        category=random.choice(list(lists.keys()))
4        self.word=random.choice(lists[category])
5
6    def anotherFunction(self):
7        for letter in self.word:              
8        print("_",end=" ")
9