# How to get index of element in a list reliably --> enumarate
# If you need to find the index of an element in a list use `enumerate` and avoid `index()`!!!


nums = [1, 2, 2, 3]

>>> for number in nums:
...     print('index, number:', nums.index(number), number)

# output:
# ('index, number:', 0, 1)
# ('index, number:', 1, 2)
# ('index, number:', 1, 2)
# ('index, number:', 3, 3)

>>> for index, number in enumerate(nums):
...     print('index, number:', index, number)

# output:
# ('index, number:', 0, 1)
# ('index, number:', 1, 2)
# ('index, number:', 2, 2)
# ('index, number:', 3, 3)