def b(): print('i am from function b') return a def a(x=b): #@1.5 x=b #print(a(x)) #print(id(x)) #print(x) #x() #print(x()) print('i am from function a') return x def c(): print('i am from function c') return b #print(id(1)) #a(c)()()()()() #a(c) print(c()) print(a())