In Python, when an array is long, you may not know at a glance what number you want to get. (When thinking about what column to take in a column such as a table) Even if I googled it, it didn't come out so much, so I made a note.
print([str(i) + ": " + x for i,x in enumerate( YOUR_LIST )])
You can do it with list comprehension + enumerate!
Example
list = ["A", "B", "C", "D"]
print([str(i) + ": " + x for i,x in enumerate(list)])
>> ['0: A', '1: B', '2: C', '3: D']