Python TypeError:当我尝试实现switch cas时，“function”对象在嵌套函数中不可订阅

Question

我试图在3台机器之间随机编码。 因为Python没有任何switch/case函数，所以我求助于if和{}。在

每台机器（line1(),line2(),line3()）也有自己的功能。 但是，我一直在犯错。在

请告诉我出了什么问题。在

machine_choice = [1,2,3]
selected_machine = random.choice(machine_choice)
print(selected_machine)

def machines(selected_machine):
    if selected_machine == 1:
        print("machine 1 randomly selected")
        line1()
    elif selected_machine == 2:
        print("machine 2 randomly selected")
        line2()
    else:
        print("machine 3 randomly selected")
        line3()

machines(selected_machine)

def line1():
if machine1["hardness"] < rev[i][1]["condition"]:
        print("\tMachine 1 hardness breached, will take 30mins for changing the system")
        machine1["hardness"] = 10

        time = line1
        machine1["schedule"].append([d,"machine 1",time,"change",30.,time.add(minutes=30)])
        print("\tno activities from {} to {}".format(time,time.add(minutes=30)))
        time = time.add(minutes=30)
        print("\tdone changing at time: ",time)
        print("\tcurrent log: ",machine1["schedule"],"\n")
        d+=1

        line1=time
        #line1 = max(time,line1,line2)
        machine1["schedule"].append([d,"machine 1",line1,"feeding",5.,line1.add(minutes=5)])
        line1 = line1.add(minutes=5)
        d+=1
        machine1["schedule"].append([d,"machine 1",line1,rev[i][0],rev[i][1]["duration"],line1.add(minutes=rev[i][1]["duration"])])
        line1 = line1.add(minutes=rev[i][1]["duration"])
        time = time.add(minutes=5)

        d+=1

        if rev[i][1]["quantity"] == 0:
            i += 1

Answer 1

I am trying to code a random decision between 3 machines.

在Python中，函数没有什么特别的，可以像使用其他对象一样使用它们。在

def machine_one():
  return 'Machine One'

def machine_two():
  return 'Machine Two'

def machine_three():
  return 'Machine Three'

machines = [machine_one, machine_two, machine_three]

print(random.choice(machines)())