Hello, everyone. I have a question to ask you. I have a string s: = "ts_flow" and then I want to take the first index. I used to use python, just say python is s [1]. But take it out and it"s a number. I want to make the judgment of if s [1] = "" and then do something, but I can"t do it now. One is that s [1] doesn"t come out of s and the other "" says that it needs to be bytes. If I change it to "", I don"t know if it will affect the judgment. So I would like to ask how to smoothly get every character in the string through the index, in addition, it is only the problem of . Thank you