python - 在 Python 函数中返回多个列表

Question

我是 Python 的新手，我正在尝试创建一个函数，该函数根据用户输入创建具有不同 Material 参数的列表，如下面的代码所示。

def material():
    layers = int(raw_input("State the number of material layers in the wall (0 for default material): "))

    rho = [] # Density [kg/m3]
    c = [] # Heat capacity [J/(kg K)] 
    k = [] # Heat conductivity [W/(m K)]
    #a = [] # Thermal diffusivity [m2/s]
    d = [] # Thickness of material [m]

    # Saveing material properties
    if layers == 0:
        rho.append(2300)
        c.append(900)
        k.append(1.6)
        d.append(3.2)
        layers = 1

    else:
        for i in range(layers):
            print "\n" "Define thermal properties for material", i+1,"(starting from left)"
            rho.append(float(raw_input("Density [kg/m3]: ")))
            c.append(float(raw_input("Heat capacity [J/(kg K)]: ")))
            k.append(float(raw_input("Heat conductivity [W/(m K)]: ")))
            d.append(float(raw_input("Thickness [m]: ")))

    return ???

我应该如何返回 rho、c、k、d 和 layers 以便我能够，例如打印 – 或使用 – 例如的值d 列表中的第二项？

print d[1]

Answer 1

How should I return rho, c, k, d and layers [...] ?

简单地做:

return rho, c, k, d, layers

然后你会这样调用它

rho, c, k, d, layers = material()
print d[1]

请注意，返回的内容越多，您就越有可能希望将它们全部包装成某种结构，例如 dict(或 namedtuple，或类等)