这是什么'For Loop'？

Question

嘿，伙计们，这段代码来自一个视频教程，让我很困惑:

import maya.cmds as mc
def jointHierarchy(topJoint , lastJoint = True):
    jointsLists = mc.listRelatives(topJoint , type = 'joint' , ad = True)
    jointsLists .append (topJoint)
    jointsLists . reversed()
    wholeChane = jointsLists [:]
    if not lastJoint:
        jointsWithoutEnd = [ j for j in jointsLists if mc.listRelatives( j , type = 'joint' ,c =1 )]

这是什么类型的循环

'''
    if not lastJoint:
        jointsWithoutEnd = [ j for j in jointsLists if mc.listRelatives( j , type = 'joint' ,c =1 )]
'''

我们有这样的结构吗

j for j in jointsLists if mc.listRelatives( j , type = 'joint' ,c =1 )

我试过这段代码，它工作正常

任何帮助

Answer 1

这就像:

jointsWithoutEnd=[]
for j in jointsLists:
    if mc.listRelatives(j,type='joint',c=1):
         jointsWithoutEnd.append(j)

EDIT:正如RobertB所说，这是列表理解:https://docs.python.org/2/tutorial/datastructures.html#list-comprehensions