在 Python 函数中返回多个列表
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Return multiple lists in Python function
提问by Christoffer
I am new to Python, and am trying to create a function which creates lists with different material parameters from user inputs as shown in the code below.
我是 Python 新手，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材料参数的列表，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 ???
How should I return rho, c, k, dand layersso I am able to e.g. print – or use the value of – e.g. the second item in the list of d?
我应该如何返回rho、c、k、d和图层，以便我能够例如打印 - 或使用 - 例如d列表中的第二项的值？
print d[1]
采纳答案by DSM
How should I return rho, c, k, d and layers [...] ?
我应该如何返回 rho, c, k, d 和 layers [...] ？
Simply do it:
只需这样做：
return rho, c, k, d, layers
And then you'd call it like
然后你会这样称呼它
rho, c, k, d, layers = material()
print d[1]
Note that the more stuff you're returning, the more likely it is you're going to want to wrap it all together into some structure like a dict(or namedtuple, or class, etc.)
请注意，您返回的内容越多，您就越有可能想要将它们全部包装成某种结构，例如dict(or namedtuple, 或 class 等)
回答by DSM
returncan return multiple values if you separate them with commas:
return如果用逗号分隔它们，则可以返回多个值：
return rho, c, k, d, layers
This will make materialreturn a tuple containing rho, c, k, d, and layers.
这将material返回一个包含rho, c, k, d, 和的元组layers。
Once this is done, you can access the values returned by materialthrough unpacking:
完成后，您可以material通过解包访问返回的值：
rho, c, k, d, layers = material()
Here is a demonstration:
这是一个演示：
>>> def func():
... return [1, 2], [3, 4], [5, 6]
...
>>> a, b, c = func()
>>> a
[1, 2]
>>> b
[3, 4]
>>> c
[5, 6]
>>> a[1]
2
>>>
回答by santosh singh
def return_values():
# your code
return list1, list2
and get the value like below
并获得如下值
value1, value2 = return_values()
回答by Archit Jain
def function_returning_multiple_list():
l1=[]
l2=[]
l3=[]
return (l1,l2,l3)
def another_fucntion():
list1,list2,list3=function_returning_multiple_list()
print list2
