分配错误之前引用的Python局部变量

Question

我是编程新手，在使用def函数时遇到一些困难。

我正在创建一个程序，该程序将要求用户选择自己选择的子程序，并通过输入1、2或3来指示。

[当用户选择他们的程序时，将提示用户输入他们所需的输入，以解决该方程式。

def main():
    def Home():
        print('''Please select a program.
        1: Linear Equation Solver
        2: Kirchoff's Laws Solver
        3: Voltage Divider ''')

        Program_Selection = int(input("Please select your program: "))
        if Program_Selection == 1:
            LES()
        if Program_Selection == 2:
            KCL()
        if Program_Selection == 3:
            VD()
    Home()

    def KCL():
        Voltage_Source_1 = int(input("Voltage Source 1: "))
        Voltage_Source_2 = int(input("Voltage Source 2: "))

        Resistor_1 = int(input("Resistor 1: "))
        Resistor_2 = int(input("Resistor 2: "))
        Resistor_3 = int(input("Resistor 3: "))

        Factor = ( - (Resistor_1 + Resistor_3) / Resistor_3)

        Current_2 = (Voltage_Source_1 + (Factor * Voltage_Source_2)) / (((Resistor_3 + Resistor_2) * Factor) + Resistor_3) * 1000
        Current_1 = (Voltage_Source_1 - (Resistor_3 * (Current_2 / 1000))) / (Resistor_1 + Resistor_3) * 1000
        Current_3 = Current_1 + Current_2

        Voltage_Resistor_1 = abs(((Current_1) / 1000) * Resistor_1)
        Voltage_Resistor_2 = abs(((Current_2) / 1000) * Resistor_2)
        Voltage_Resistor_3 = abs(((Current_3) / 1000) * Resistor_3)

        Power_Resistor_1 = abs(Current_1 * Voltage_Resistor_1)
        Power_Resistor_2 = abs(Current_2 * Voltage_Resistor_1)
        Power_Resistor_3 = abs(Current_3 * Voltage_Resistor_1)

        print("Current 1:", round(Current_1, 3), "mA.")
        print("Current 2:", round(Current_2, 3), "mA.")
        print("Current 3:", round(Current_3, 3), "mA.")

        print("Resistor 1 Voltage:", round(Voltage_Resistor_1, 3), "V.")
        print("Resistor 2 Voltage:", round(Voltage_Resistor_2, 3), "V.")
        print("Resistor 3 Voltage:", round(Voltage_Resistor_3, 3), "V.")

        print("Resistor 1 Power:", round(Power_Resistor_1, 3), "mW.")
        print("Resistor 2 Power:", round(Power_Resistor_2, 3), "mW.")
        print("Resistor 3 Power:", round(Power_Resistor_3, 3), "mW.")
    while True:
        KCL()
        if input("Would you like to repeat the program? (Yes / No): ") == "Yes":
            KCL()
        else:
            Home()

main()

因此，为了能够调用KCL部分，我必须先对其进行定义，因此我尝试将其放在def Home（）：部分之前；但是，这将导致在Home（）节之前调用KCL节。

再次，我对编程非常陌生，因此，我将为此提供任何帮助，我将不胜感激。

谢谢。

Answer 1

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