def foo1():
	print("foo1 running...")
	return 1

def foo2():
	print("foo2 running...")
	return 2

def foo3():
	print("foo3 running...")
	return 3

def default():
	print("default running...")
	return 0

option="case3"

result = {
    'case1':     foo1,
    'case2':     foo2,
    'case3':     foo3,
    'default':   default,
}.get(option)()

print(result)