关于没有索引的切片和 for 循环的简单问题

Question

If I was making this loop:

for i in range(len(array)):
  for j in range(len(array)+1):
    # some code using array[i] and array[j]

Would there be a way to do the same thing in this format?

for element in array:
  for next_element in array:
    # some code using element and next_element

Or would I just be better off using the i, j format?

Answer 1

You mean like this?

for element in array:
    for next_element in array[1:]:
        # some code using elemnt

I guess it all depends on your end goal or personal preference. What I did here is start our second loop from the second value towards the end. If you need the indexes, you can use enumerate() like this:

for index_a, element in enumerate(array):
    for index_b, next_element in enumerate(array[1:]):
        # some code using the elements and the indexes

Answer 2

for element in array:
  for next_element in array[1:]:
    # some code using element and next_element

Please note that your first loop will throw an index error because j goes out of bounds on the last iteration.

Answer 3

The i and the j could be anything you want it to be, inside the for loop it's going to mean the same thing. Hopefully I understood your question correctly.