python - 仅用于列表列表中第二项的循环。 (Python)

Question

我有什么

是这样的

def mymethod():
    return [[1,2,3,4],
            [1,2,3,4],
            [1,2,3,4],
            [1,2,3,4]]

mylist = mymethod()

for _, thing, _, _ in mylist:
    print thing

# this bit is meant to be outside the for loop, 
# I mean it to represent the last value thing was in the for
if thing:
    print thing

我想要什么

我想做的是避免虚拟变量，有没有比这更聪明的方法

for thing in mylist:
    print thing[1]

因为那样我就不得不在任何其他需要的时候使用 thing[1]，而没有将它分配给新变量，然后事情就变得一团糟了。

刚接触 python 很抱歉，如果我遗漏了一些明显的东西

Answer 1

你可以破解一个生成器表达式

def mymethod():
    return [[1,2,3,4],
            [1,2,3,4],
            [1,2,3,4],
            [1,2,3,4]]

mylist = mymethod()

for thing in (i[1] for i in mylist):
    print thing

# this bit is meant to be outside the for loop, 
# I mean it to represent the last value thing was in the for
if thing:
    print thing