#python #tutorial #course 00:00:00 string indexing 00:05:17 last 4 digits exercise 00:06:27 reverse a string exercise 00:07:06 conclusion # indexing = accessing elements of a sequence using [] (indexing operator) # [start : end : step] credit_number = "1234-5678-9012-3456" print(credit_number[0]) print(credit_number[0:4]) print(credit_number[:4]) print(credit_number[4:8]) print(credit_number[4:]) print(credit_number[-1]) print(credit_number[-4:]) print(credit_number[::2]) print(credit_number[::3]) # EXERCISE 1 credit_number = "1234-5678-9012-3456" # last_digits = credit_number[-4:] # print(f"XXXX-XXXX-XXXX-{last_digits}") # EXERCISE 2 credit_number = "1234-5678-9012-3456" credit_number = credit_number[::-1] print(credit_number)