python for iterate loop check next item

https://stackoverflow.com/questions/1011938/python-previous-and-next-values-inside-a-loop

Python - Previous and next values inside a loop

 

This should do the trick.

foo = somevalue
previous = next_ = None
l = len(objects)
for index, obj in enumerate(objects):
    if obj == foo:
        if index > 0:
            previous = objects[index - 1]
        if index < (l - 1):
            next_ = objects[index + 1]
Here's the docs on the enumerate function.

enumerate객체로 만들긔