Version: Python 3.7

for obj in group_obj.objects:
            bpy.ops.ed.undo_push()
        --> move_rotate(obj, T, T_0)
        |
        |   if check_if_cross_wall(obj):
        |       bpy.ops.ed.undo()
        ________from there


            count  = 1
            accessableArea(obj)
        

Here is my code. My target is to check if the condition is satisfied, and if it is True, it will reverse the operation and goto the first line directly. I think goto is the most suitable way to do this, but I just know goto in C or C , and Python does not have this.

Is there any other way to do this?

My code logic is:
Move & rotate the object, then check if it crosses the wall. If True, reverse the operation, then move & rotate again and check if it crosses the wall. If False, it will save the current state and go to the next object.

CodePudding user response：

No, there is no "goto" in Python. To accomplish the sort of jump you describe, you can use a while loop with a continue statement to move back to the start of the loop and break to exit the loop, like this:

for obj in group_obj.objects:
    bpy.ops.ed.undo_push()
    
    while True:
        move_rotate(obj, T, T_0)
        
        # as long as this is true, it will keep
        # moving back to the start of the loop
        if check_if_cross_wall(obj):
            bpy.ops.ed.undo()
            continue
            
        # Exit the loop when the condition
        # above wasn't true
        break

    count  = 1
    accessableArea(obj)

Alternately, you could structure it like this, where it breaks when the condition is false and otherwise just does "undo" and starts over (no continue needed):

for obj in group_obj.objects:
    bpy.ops.ed.undo_push()
    
    while True:
        move_rotate(obj, T, T_0)
        
        # exit the loop when the condition is false
        if not check_if_cross_wall(obj):
            break

        # otherwise undo and run the loop again
        bpy.ops.ed.undo()

    count  = 1
    accessableArea(obj)

CodePudding user response：

No. If you want to jump in your code, you will have to use functions:

def func0(n):
    return n - 5

def func1():
    print(1)

def func2():
    print(2)

if func0(5) > 0:
    func1()
else:
    func2()