Another solution, much more verbose but certainly more readable:
str = "ABBBCCDDZ"
parts = 
last_char = ''
current_chunk = ''
for i in range(len(str)):
current_char = str[i]
if (current_chunk == '') or (last_char == current_char):
current_chunk = current_chunk + current_char
current_chunk = current_char
last_char = current_char
Also available here:
- Antonio Ognio, Lima-Peru
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