def octal_to_string(octal): result = "" value_letters = [(4,"r"),(2,"w"),(1,"x")] for i in [int(n) for n in str(octal)]: for value, letter in value_letters: if i >= value: result += letter i -= value else: result += "-" return result print(octal_to_string(755)) # Should be rwxr-xr-x print(octal_to_string(644)) # Should be rw-r--r-- print(octal_to_string(750)) # Should be rwxr-x--- print(octal_to_string(600)) # Should be rw-------
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