I have a list that’s include repetitive elements. I need to change repetitive elements to ElementNameElementNum.
Example:
["a", "a", "a", "a", "b", "b", "b", "c", "c", "a"]
How can I change this array to:
["a4", "b3", "c2", "a"]
There is 4 a that is repeating, 3 b and 2 c is repeating back to back too. But last a is not repeating so it will stay as "a".
>Solution :
You can use itertools.groupby:
lst = ["a", "a", "a", "a", "b", "b", "b", "c", "c", "a"]
result = []
for item, group in itertools.groupby(lst):
count = sum(1 for _ in group)
result.append(f"{item}{count}" if count > 1 else item)
print(result)
Output:
['a4', 'b3', 'c2', 'a']