This is actually a great application for a python list comprehension one-liner!
my_str="123456781234567812345678"
splits=[my_str[x:x+8] for x in range(0,len(my_str),8)]
//splits = ["12345678","12345678","12345678"]
Let me know if you have any questions.
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solved How can I split a string in Python? [duplicate]