Python 阻力计算器表示指数超出范围

我目前正试图写一个程序，收集所有电阻，计算，然后得到电压，然后计算电流。以下是我到目前为止的情况：

resistors = [0]


def ObtainResistors(resistors):
    for i in range(1, 8):
            value = int(input('please enter resistor %d:' % i))
            resistors.append(value)
            return


def TotalResistance(resistors):
    rt1 = ((resistors[2] * resistors[3]) / (resistors[2] + resistors[3]))
    print(rt1, 'ohms')
    rt2 = (rt1 + resistors[4])
    print(rt2, 'ohms')
    rt3 = ((rt2 * resistors[5]) / (rt2 + resistors[5]))
    print(rt3, 'ohms')
    rt4 = (rt3 + resistors[7])
    print(rt4, 'ohms')
    rt5 = ((rt4 * resistors[6]) / (rt4 + resistors[6]))
    print(rt5, 'ohms')
    rt6 = (rt5 + resistors[1])
    print(rt6, 'ohms')
    rt = (rt1 + rt2 + rt3 + rt4 + rt5 + rt6)
    print(rt,  'ohms')
    return


ObtainResistors(resistors)
print(resistors)
TotalResistance(resistors)
print(resistors)

这是我跑步时得到的

please enter resistor 1:1
Traceback (most recent call last):
  File "C:/Users/User/PycharmProjects/Introduction_to_Python/RESISTOR COURSEWORK.py", line 31, in <module>
    TotalResistance(resistors)
  File "C:/Users/User/PycharmProjects/Introduction_to_Python/RESISTOR COURSEWORK.py", line 12, in TotalResistance
    rt1 = ((resistors[2] * resistors[3]) / (resistors[2] + resistors[3]))
IndexError: list index out of range
[0, 1]

Process finished with exit code 1

请输入电阻1:1
回溯（最近一次呼叫最后一次）：
文件“C:/Users/User/PycharmProjects/Introduction_to_Python/RESISTOR COURSEWORK.py”，第31行，在
总电阻（电阻器）
文件“C:/Users/User/PycharmProjects/Introduction_to_Python/RESISTOR COURSEWORK.py”，第12行，共电阻
rt1=（（电阻器[2]*电阻器[3]）/（电阻器[2]+电阻器[3]））
索引器：列表索引超出范围
[0, 1]
进程已完成，退出代码为1

如果在回路中返回

，则仅读取1个电阻值

将
return
移出循环，或者将其删除，因为Python不需要显式返回，并且您没有返回值：

def ObtainResistors(resistors):
    for i in range(1, 8):
        value = int(input('please enter resistor %d:' % i))
        resistors.append(value)
    # return